Samsung standard now is 3 years of software updates and 4 years of security updates. Not bad at all.
Really? You think that abandoning a device after 3 years is acceptable? Wow, ok. Yes, I know that they distribute security updates for 4 years but those are largely provided to them to distribute, apart from device-specific vulnerabilities that are added in by each phone manufacturer. The costly effort goes into personalising the Android core so that it becomes Samsung Android vX +1.
How long should that $2K+ Fold 3 physically last for? Should it be ready for the bin in 4 years? Are you ok with the risk that unsupported software brings? Or would you prefer to access a 3rd-party ROM of the latest Android version? This ROM will typically weigh in at around 25-30% the size of Samsung original & offer many performance improvements, returning the 4 year old phone to useful life. Oh, except for the camera because Samsung will sabotage it. Environmental vandalism. Now that your restoration option has been removed, you are left with a physically good handset that demands risk to use it.
I remember when Galaxy S5 was current, mine was running Cyanogen & my friend's S5 - we bought them at the same time - was on stock OS. He went to make a call from where we were - one of those steep dips off Hillsborough Rd but couldn't because no reception. My phone showed 3/5 bars & made that call without an issue. But if my camera was destroyed by the process of installing non-Samsung Android, I wouldn't have done it. My phone would have been stock & neither of us would have been able to make that call. Because I wouldn't want Samsung to deliberately vandalise my phone. Fold 3 is substantially more expensive than S5.
If they're determined to take opportunity from the userbase, then surely Samsung should stand behind their expensive phones for a little while longer?