Server side package or emrbace Apex and use its capability

This may not be a suitable question for this forum but I can only try.
My experience with APEX is primarily doing everything in the APEX “front end” and only calling PL/SQL packages in the database when absolutely necessary.
A colleague insists on putting everything in a PL/SQL package in the database and putting calls in APEX to functions & Packages.
One example I can quote is we had a conditional tab which could only be viewed if you had an entry in a table.
I did the SQL code for the tab in the conditions section in apex. My colleague then reworked my code to call a PL/SQL package and placed the code I had written on the server.
Another example was a demo of lazy load on an input field he loved it but then when he realised it could not be done via a call to a server side package dismissed the lazy load idea as not relevant even though it would make our users life easier.
I am soon to have a battle royal over which is the best approach. Any comments.

First of all: All PL/SQL Logic you enter, either in APEX or in packages is always executed on the server. Your browser doesn't understand PL/SQL very well...
Putting PL/SQL logic in packages - instead of in APEX regions - has some advantages though (not extensive list):
- You can easily unit test package procedures/functions.
- You can reuse the package procedures/functions in the same app or in other apps as well.
- PL/SQL code in packages is compiled in APEX it's dynamic and has to be parsed, so creates some overhead.
- When you make changes to your codebase or columns you can spot that in your PL/SQL packages (they might get invalid). You won't notice that in your APEX regions until you (or end user) run the page and encounter an error.
So, yes, putting logic in packages has advantages. But on the other hand, a statement like "if we can't do it in a package, we don't do it all" might be a little to restrictive...
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Server side package or emrbace Apex and use its capability

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