Same here. My 2012 MBP has been upgraded with more RAM and a SSD and the battery is replaceable (but it's lasted better than my work 2017 model and is healthier!) but the cost of the new devices is so astronomical it'll be the last one I buy. Since I will have to invest in a new ARM device just to develop for their new platform, it's goodbye Mac and back to Linux (already got Windows as a side Dev machine).
I've upgraded hard drives and RAM on very single Mac I've ever owned, except the last Mac I purchased, a 2015 MBP, where it wasn't an option.
It's looking like this one will be literally the last Mac I purchase. Apple's practice of charging premium, bespoke prices for commodity hardware was insulting, but at least there was a reasonable workaround before they started the soldering crap. Soldering things down is just a brazen money grab.
Can't believe I'm looking at going back to Windows but here we are.