The Librem 5 is better than that. For sure there are some annoyances, including bugs, but it is not “experimental”.
All bugs and design flaws potentially detract from security and privacy. For a phone that is marketed in that direction, you wouldn’t want too many bugs and design flaws.
That being said, one of the core aspects of the Librem 5 is that it is your phone. Noone seeks to stop you running GNUnet on your phone.