Normal people aren’t flashing custom ROMs. The audience for some FOSS software will shrink by several orders of magnitude.

But the pain really kicks in when your government/bank/streaming apps require attestation of a signed boot chain and Google Play services running.

I can agree on Apple not really having a properly supported hardware repair ecosystem, and actively working against third party repair.

But the software? When Samsung and friends had 2-4 years of security updates, Apple had almost twice that. The iPhone XS still has support, 6 years after end-of-sale, 7 years from release. Normal people can’t be expected to flash their phones with LineageOS. The situation is slightly better nowadays, but Samsung still seems to be depreciating 3 year old devices: https://endoflife.date/samsung-mobile