Unless that impression is wrong (possible), does that mean that a) Android and iOS devices are now fundamentally less secure than these new distros with disk-level encryption enabled or b) that encryption is really just a hard problem and this isn't actually unique to phones, it's just that police have more opportunities to try to break into phones than they do into laptops, so it gets more attention?
Both iOS and Android use hardware full disk encryption and RAM encryption.
Keys for all files are in RAM, keys for RAM are in Secure Processor, so you can’t dump data from RAM chips via direct electrical connection and see keys for files.
At least based on yours and sibling comments, the title "modern phone encryption kind of sucks" is really more that encryption on modern hardware in general is somewhat fallible, and that phones are just the canary in the coalmine that demonstrates it.
I guess I was asking if, in a world where someone could (feasibly, if not easily) take one of the existing mobile Linux distros and modify it to make it more secure than Android or iOS, or if they're already sort of at the limit there and barring a fundamental advance in computer security across the board, this is just how things are?