A kernel which has been tested in a community of 50 students all of whom have similar hardware is not the same as a kernel which has been tested in the IBM labs, the worldwide Linux community, or even, god help us, at Microsoft. And the toybox kernel just isn't going to give what you expect of an OS/2 kernel. On the other hand, the qualities of OS/2 that are most praised above the kernel level are the WPS, the GUI, and the filesystem.

You can try to use a Pinephone or whatever but it's cheap shit that dies when it falls into a puddle and isn't actually secure to the standard people expect because all the software is alpha quality or just run of the mill musl/toybox/etc or GNU stuff with no real equivalent to the security models of Android and iOS. Thats why GrapheneOS is on Google phones. Make a secure phone if you don't like it, because they have no other options right now.