Most people aren’t comfortable with flashing unofficial ROMs onto garbage bin phones. I’m unironically glad that you have rescued a perfectly good phone but that’s just not a scalable solution IMO. Buying a used phone that you know has a lineage ROM is a more viable path but you’re still back to square one if the battery or port or screen give up on you.

Yes of course. The point of this phone is to trade cost/perf/etc for improved repairability and business ethics. Long software support is a prerequisite for repairability being useful.

This phone isn’t for people looking primarily for best value.

7 years is only for Pixel and S24 phones. The vast majority of existing Samsung phones will only get 5 years of security updates.

https://www.howtogeek.com/797200/how-long-will-my-android-phone-be-supported-with-updates/