Interesting, possibly useful as a daily driver.
Also: link for the best pro comment about linux phones I've read on HN: https://news.ycombinator.com/item?id=26080871
If your distro ships the latest version of Chatty alongside mmsd-tng[0], SMS as well as MMS (both bidirectional) work supremely well, I trialed it as a daily driver for all of last month and didn't drop a single SMS/MMS. MMS attachments (images, didn't try video), group chats, everything was fine.
I still had to configure APN settings manually, but there was no faffing about on the command line, it just worked. All the other points, though, yeah... those are still accurate.
[0] https://gitlab.com/kop316/mmsd
Edit for clarity: this comment (and the link in the parent) references the PinePhone, not the Librem 5, though they're roughly comparable devices