They certainly used to. My wife's 2012 MacBook Pro has upgraded RAM and SSD parts I've put in over the years and still runs fine, though it isn't used much anymore and OS upgrades stopped a while ago.
Their current environmental marketing is pure greenwashing bullshit and their stances on upgradability and repairability are terrible.
Yeah, if Voice doesn't have RCS support by the time iOS 18 launches, I'll be moving off it for messaging. Have a number of text groups with iPhones that will benefit from everyone on RCS, most important knowing that my group messages were actually received. MMS still randomly drops messages or they get massively delayed or received out of order.