Why should I NOT use Finder to remove old TM backups?

I have a new Macbook Pro running Mavericks, and my old Macbook was backed up to an external hard drive using Time Machine.
I want to create some space on the external drive, but I don't want to delete all of my prior backups, in case I find out later that something I migrated to the new machine is corrupted or broken. I understand you can delete old backups using either TM or Finder (or Terminal, but I don't feel comfortable with that), but many posts I've read warn against deleting old backups using Finder; is this a bad idea, and if so, why?
Also, I know that TM creates hard links to files that are in previous backups, rather than actually making multiple copies of the same folder. Are the actual files stored in the backups.backupdb folder, or in a different location?
Thanks!

Time machine is an incremental backup - if you back up everything you can restore your hard drive to a point in the past - hourly - last 24 hours - end of day - last month - end of week until Time machine starts consolidating for room.
Time machine does an initial full backup - all other backups are files that changed only. You will get large backups if you rebuild IPHOTO library as that entire library will be backed up rather than only that which changed.
Cleanup is the point where daily is merged into weekly (most recent in the time frame is kept) and hourly is merged into a daily so you may see GB used on your time machine drive decrease or fluctuate around a point for a period of time.
Also means you can restore folder, items, and at least in snow leopard - if you want one IPHOTO picture - simple open IPHOTO - then go into time machine and you can get it.
In Yosemite - time machine if active will keep missed backups on your hard drive until you connect the TM drive (that is new for lap tops I guess)
Desktop I keep time machine connected and the hourly backups and cleanups don't cause any problems.
If a file does not change there may be only one backup on the TM drive.
If you want to keep a backup of something you downloaded - but want to delete it off your hard drive - back it up to a separate device - as time machine will eventually remove it from TM.
If you want to delete something on time machine that you no longer want user enter time machine - does prompt you if you want to remove all instances of the item. Doing it that way will keep the chain clean.

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