This would apply to all consumer electronics besides smartphones, such as smart TVs, gaming consoles, etc.

Android has problems with how each device uses a forked kernel with vendor binary blobs only working for that specific forked kernel. PostmarketOS is trying to avoid these issues by upstreaming the drivers so they can be maintained normally when the kernel changes.

Yes having a trusted entity maintain the software is a big problem.

But giving the option to install your own software would be a big step in keeping the devices in use.