Not true. FreeBSD and OpenBSD have had various wlroots compositors such as Sway available for some time. e.g [1] Some people have even been experimenting with KDE-wayland on FreeBSD since 2021.
Wayland support on any OS is not binary because there is no single layer like Xorg. It's a matter of individual compositors and their components being ported to the OS, which is a matter of popularity, and the BSDs are always at a disadvantage in that respect, so they lag behind, same as other software. Nevertheless, they are definitely gaining support. Then again this distinction is only technical, for functional support new DEs/WMs would always have needed to be ported regardless of display architecture, the only case it would not is for an Xorg drop-in, which defeats the purpose.
> Lack of screenshots/screencasts is a failure.
... but there are many functional screencapture apps, and even browser support, I use this pretty much every week. I think you might be operating on out of date info. I'd highly recommend giving it another try, the Wayland ecosystem has come quite far over the last decade.