There is an additional connection between the memory and the logic board. Why do you assume it takes a 20 foot drop to cause a RAM socket to fail? Sometimes it takes a bent pin on the socket from a user who isn't being careful when installing new RAM.
Either way, I don't have any hard numbers related to Apple products because I don't work at that AASP anymore. I can tell you from a design standpoint that simpler is better. Less moving parts is more reliable.
It has nothing to do with a computer being "bounced around." You've obviously formed your own opinion and nothing I say is going to change your mind.
So if someone doesn't agree with you it's a "ridiculous unrealistic claim." But because Apple profits are up from 38% to 40% it's obviously related to non upgradeable components? That makes your opinion a fact?
Don't ask someone else to come up with hard facts if your not willing to accept that your whole premise is based on an opinion.
You're correct that new OSX releases require more RAM. El Capitan requires a whole 2GB!
I've used several mid 2012 MBP with stock 4GB of RAM and they run El Capitan just fine.
My old mid 2009 MBP shipped with 4GB of RAM and it'll even run El Capitan.
I know plenty of people who will use a computer stock, with no hardware upgrades, for the entire useful life of that computer. Sometimes that's 3 years. Other times it's 8 years. I know a few folks who are using stock original MacBooks from 2007-2008.
Anyway, we're both operating on our personal experience here, so it's not like your experience is any more or less valid than mine. I doubt we'll come to any kind of agreement...so...moving on.