Debian has really old repos and uses a much older kernel in most cases. Framework hardware is new and cutting edge in some categories. Being mainstream does not mean that they focus on professional environments or offer paid support, etc.
It is not that it CAN’T work just that they don’t have the employee bandwidth to take on supporting all of them. I am impressed that they have actual Linux support specialist on staff. I think that is already supporting Linux more than other manufacturers.
You have a fair point there. Although, I think isn’t debian more popular then fedora?
I don’t think more popular then arch or ubuntu though.
Yes it has old packages, but still.
In any case though, they don’t have to support linux that is true.
Well not as in more than mainstream computer companies anyhow.
They could just do a neutral approach and leave it to the users to port. But thankfully they don’t.
Can confirm. I dual boot Arch Linux and FreeBSD on my AMD framework laptop. A lot of it works. Not everything (for example, my thunderbolt 4 dock isn’t working under FreeBSD) but enough works that I regularly use it and often prefer it over my Linux install.
Unrelated to FreeBSD: I haven’t seen any of this distro toxicity that this thread claims exists on this forum. I’m pretty confident this is a non-issue. Plus who cares that y’all noobz chose the wrong distro when you started by choosing the wrong OS, all the cool kids run FreeBSD 
Debian works, and I don’t care what you run. If you like Ubuntu that’s fine. I grew up using HP UX and Sun OS, Debian with XFCE feels super comfortable and runs on Framework without any issues. They should say it’s supported, and other desktop environments probably look better. If a bunch of people were posting “Run NetBSD or die” that would be a different story. I’ve never felt distro pressure here except to use supported distros and that’s not a lot of pressure.
Bingo. To be honest, the only “distro toxicity” I see is from the OP, who is demanding everyone stop seeking help for anything outside of ubuntu and fedora. This is a community supported forum. People should not feel like they are not allowed to ask questions just because it’s not a distro the OP approves of.