Whether Tow Boot or uboot is on the SPI flash isn't really relevant to distros. The
point is that distros shouldn't have to worry about shipping uboot, just like Fedora
doesn't ship UEFI firmware for x86-64. Tow Boot has some UX advantages for mobile
devices that may or may not be wanted in upstream uboot. Please read Samuel's blog
post if you haven't already:
https://samuel.dionne-riel.com/blog/2021/05/10/unveiling-tow-boot.html
Regarding imagefactory and oz, it looks like those are for cloud images? I'm confused
what that has to do with mobile phones. I'm talking about the Workstation/Plasma/XFCE
images on
https://alt.fedoraproject.org/alt/
As for encryption, we could encrypt the filesystem in a loopback image or with Tow
Boot's USB Mass Storage mode if Plymouth could show an on screen keyboard to decrypt
it.