Libinput's bus factor is 1 (2019)
I guess the problem is that nobody is generating revenue in a meaningful way with desktop Linux.Firms running Linux on servers can pay their employees to contribute to open source.But a peripheral input driver?
Ubuntu had a shot at being "Desktop Linux" but it didn't pan out.Especially when remote desktop on Linux is not very good. (I've only used VNC and XRDP) not to mention a lot of extra packages.