RTFM is not a working formula. Because most people skip reading the manual for one simple reason, the manual is hard to read.
I remember my early arch days when asking a question about an issue I’m having was always met with a wikipage I already read but did not understand.
Rather than pushing for a magic manual, the best is to provide sane default or point to tutorials.
It’s hard to read because it’s a manual made for technical users.
On Linux most of the software is made by freelance developers who often forget that all users are not technical and even if they are they don’t want to be forced to interact with technical stuff. For the same reason I don’t want to daily-drive gentoo, sometimes I don’t want to read the manual.
I happen to be a contributor on multiple FOSS project and most didn’t have a docs directory in their repo or website, let alone an user guide. That’s fine for a CLI program to rely on wiki/manuals but graphical apps should have a user guide on their website. Working on documentation is a thankless job in FOSS spaces.