New e-mail address, so created new apple id, iTunes store asks for password for old e-mail/apple id

Question

There are lots of posts on this subject over the years about this problem but none of the solutions work for me.
Apple id problems go back many years, if they cant handle that, how do we trust them in security issues?
anyway, here is what it says.
Sign into iTunes store
Enter the Apple ID password for
"old e-mail address"
So I enter the password (same one as before, it works in Mail etc on the iPad, only a problem on iTunes store.
App updates would not work, but they finally did when I did a iPad reset and backup restore.
But the iTunes store apple id problem is still there.
I am a user of Apple since 1982, do not like where things are going, honestly, but they are the only game in town. Not a fan of overly automated system processes with no feeling of "transparency" in the way things happen these days. 
Can anyone help?  If not I will live with it, but..........this is not the old Apple any more.

Answer 1

It may not be called Express lane any longer, but this is where you find it now: https://getsupport.apple.com/GetproductgroupList.action
On your old email - Apple does not assume an email will not change. This is why they provide for recovery if you no longer have access to the email. In order for that to work however, you needed to have followed their recommendation and set up your security questions and/or provided a secondary email address. If you not longer have access, they you can try calling Apple and asking for the Account Security Team. If you can convince them you are who you say you are, they may be able to help reset your password.
Are you saying iTunes on your computer is updating all Apps? If so, I don't understand how. Apps purchased on your old Apple ID are able to be updated only using the Apple ID used to purchase or download them. If what you ar esaying is true, I suspect only thos apps tied to your new Apple ID are being checked and updated. If it is happening as you describe, your iPad is the one behaving as it should, not iTunes on your computer.
Please do not take offence to this but it still seems as if you don't understand how the Apple ID works, not just that you don't agree with it. I've refined my analogy a bit, so please bear with me. I am not trying to be condesending but I HAVE tried to made it as simple as possible for anyone else that may read this.
Imagine you buy a house. You have keys to the house and once inside, you buy all the funrniture you need - with one condition - because of some complicated distribution agreements with the furniture manufacturers, the seller mandates that the furniture you buy must be used only in that house.
Some day in the future, you lose the keys to your house so you buy the house next door with its own new set of keys. You go inside the new house and wonder where all your furniture has gone. Simply, you own both houses but
Upset at this situation, you try to recover your keys to your first house by asking the bank to mail them. You once had the chance to give the bank an alternate address to which they could mail keys but didn't so not they can only mail them to the first house. Since you can't get inside, you cannot retrieve the new keys that they send.
After getting some good advice, you decide to talk to visit the bank personally. You convince them you are the owner of house #1 and they give you a new set of keys. Yay!
You go back to house #1 and finally manage to get in. But, since house #2 is newer, you decide to live there. Now you want to move your furniture so you have a comfortable place to sit and sleep. Oops, you can't take the furniture from the old house because of your agreement with the Furniture seller so you have to buy new furniture.
House = Apple ID
Keys = Password
Furniture = Apps and other content purchased with the first Apple ID
Keys = Password
Alternate Address = Alternate Email Address
Furniture Seller = Apple
Furniture Makers = App Developers, Film and Music Rights Holders
You may not agree with this, but the fact is, Apple owns very little of the content they sell - basically only their own apps and iOS itself. Allowing merging of Apple IDs or transfering ownership of Apps from one Apple ID to another is a logistical nightmare and would create major issues with app developers, music and film rights holders and anyone else who provides content for sale through iTunes or the App Store.
You cannot compare a functioning iCloud with non-functioning iTunes and App Stores. iCloud doesn't care about your apps - it's about syncing and identification (iMessage, Facetime, iCloud services like Find My iDevice) only. So long as you are using the same Apple ID on each device, it will sync between them any supported content you decide. In fact you can use a different Apple ID for all there if you wanted. The key is to be CONSISTENT.
One additional thing we have not brought up already. If the iPad was activated with your original Apple ID and you ever need to restore it (not an uncommon possibility), you will run into a problem with Activation Lock. It's a security feature designed to discourage iDevice theft by rendering it useless if one tries to activate it using anything other than the Apple ID used to activate it originally.
Again, you may not agree with how it works, but I hope this finally makes sense and you at least understand how it works.