I think the most complex thing a Linux novice might encounter is reflashing the device (to upgrade the OS version, or reinstall to correct a malfunctioning phone), but even that is easy if one is able to follow the posted directions, cut and paste commands into the terminal, and hit the Enter key.
All the rest is learned over time on an as-needed basis, which is the same way all of us probably learned Linux desktop in the first place.
That said, it’s important to temper your expectations. Things will be mostly functional, but not perfect or polished as with modern smartphones. The L5 is a full computer with phone capabilities, but the computer part is more capable at the moment. Everything is improving over time, though.
For instance, suspend works the way it would on a laptop, but might not always be amenable to waking up during incoming phone activity.
The OS is not so much built on a “mobile apps” ecosystem as the other systems. The existing applications are adapted from real, regular Linux applications/programs, so there is the potential to have thousands of options… if developers of those existing applications write them to adapt to the small screen and the phosh
(phone shell) environment. Lots of them already work, some can work with scale adjustment on the fly, and some don’t work at all yet on the L5.
There is the possibility of installing Waydroid in order to get many Android apps functioning, but many (e.g. some commercial Android apps) will never work, or may not work well.
The phone is heavier and bulkier than most people are used to. This is because the components needed to achieve isolation, security, and privacy are separate, not consolidated on a single chip. The L5 also gets quite warm due to the frame’s being designed to act as a heat sink.
The battery is removable and replaceable, but you may find yourself having to recharge it or swap it out more than once a day. It can drain quickly, depending on your activity level.
Navigation may not work as well as you need right now.
To use the L5 internationally, you’ll have to own a separate modem card, which can be bought from Purism and swapped out, but it’s a very delicate operation that can result in broken connectors. It’s not recommended to change the modem very many times.
I’ve owned my Librem 5 for 3 1/2 years now, but I’m still not using it as my main phone yet. I love it more for its being a portable pocket computer than a phone (at present).
I don’t own a Pinephone, but people who own both it and a Librem 5 frequently comment on the L5’s vastly superior performance.
As others have said, if you’re committed to achieving as much privacy as possible, then the L5 is your best bet, as long as you can endure some inconvenience.
Also, the camera is functional and improving, but not on a level with commercial products.