[edit] On My phone "System" is listed as 11 GB, other google apps add up to another couple GB, and my music collection is 14GB so out-of-the-box I could see me having just 5GB free with no other apps.
It makes specific points to say that it is meant for those who don't want the phone to be a distraction. I don't recall the camera specs, but I can't imagine it's good by 2020 standards. Music, sure - it seems like the right size for a good MP3 player (remember that term, kids?)
I like the idea of a palm phone. Part of me thinks about getting a phone like it, and then a Oneplus 7T phablet, and swapping the SIM like you would swap a watch for different occasions.
Actually, depending on the response time and the reliability of getting SMS and calls post-swap, that sounds tempting...
I own a sansa clip plus. It has a 32GB microSD card in it. An out-of-the-box storage of about 20GB would make the Palm phone a downgrade from my MP3 player.
https://palm.com/