It really doesn't matter if the model is 100x more efficient than doctors, it will go nowhere. Anything that threatens the stability of the medical professionals will face so many legal challenges that even deep pocket companies won't stand a chance. There is a reason medical school spots are artificially limited... programmers seem to be the only ones trying to automate themselves out of their jobs.
It's sad but true. Go look at any medical subreddit about ChatGPT, you all a sudden have 100s of AI experts trivializing GPT and suggesting it's nothing more than autocorrect.
PostmarketOS is the mainline Linux kernel and doesn't have all the features that are needed for a proper Android phone. There are a lot of Android userspace drivers that may break with another kernel.
Custom kernels are not upgraded kernels. They usually just back port a few fixes. No custom kernel running Android has a full kernel upgrade because it breaks the KMI and kernel drivers aren't usually updated.
Depends on the manufacturer, there are plenty of phones with community updated kernels. Some manufacturers choose to implement hardware support by poorly forking the Linux kernel in ways that make porting those changes to recent kernels hard.
Android manufacturers pick a LTS kernel when developing their phone. By the time it is on the market, that kernel version only has 3-4 years left of security updates. Custom roms never upgrade the kernel so you are still vulnerable to bugs that were never backported to your kernel
The problem is after 3-4 years, the only batteries you can find are from aliexpress or drop-shippers on Amazon. How does one trust these batteries from exploding in the middle of night especially if you fall asleep with your phone next to you.