I think the problem with btrfs is that it entered the spotlight way to early. With Wayland there was time to work on a lot of the kinks before everyone started seriously switching.
On btrfs a bunch of people switched blindly and then lost data. This caused many to have a bad impression of btrfs. These days it is significantly better but because there was so much fear there is less attention paid to it and it is less widely used.
You are welcome to start a movement to get Debian to switch. You will be swimming up stream but you are welcome to try. Debian has been the same for decades and people like that.
You didn’t get my point. Btrfs is one OG distro removed from being THE standard. It’s doing a lot better than you’re making it out to be.
It’s not like Btrfs is dunking on all other file systems and Debian is being unreasonable by defaulting to ext4. Instead, Btrfs wins some of its battles and loses others. It’s pretty competent overall, but ext4 (and other competing file systems) have their respective merits.
Thankfully, we got competing standards that are well-tested. We should celebrate this diversity instead of advocating for monocultures.