SHJ
perhaps because the last two upgrades were crap , not as bad as Windows 8, but certainly not something that justified having to buy them.I am not an Apple fan -wife's machine- but I do think it was a wise customer relations move to give away Yosemite and give them a stable platform going forward.
I upgraded a 2009 vintage iMac RAM very easily because it is designed to accept an appropriate upgrade-just undo a little panel at bottom of screen and swap out the memory modules .
PB