Red Hat have been funding Wayland since its birth. Its main goal was not to be "more polished", but rather to ditch 30 years of backwards compatibility (which some might see as cruft), re-architect for a "modern system" (i.e. Linux-specific features), and assume it should offer
better performance -- which I accept does matter, especially if you're selling OSes for laptops or tablets running on batteries. If Red Hat succeed in getting Wayland to displace X11, they gain another moat (as they already did with systemd vs initd, PulseAudio vs ALSA, and so on)
Initially, Wayland was an option, unsupported. Next step was offering Wayland as a supported option alongside X11. This is the expensive part, where their release testing and support has to cover both systems simultaneously! The sooner they ditch X11 and start saying WONTFIX to bugs and glitches, the sooner they save money!
I'm sure they're aware of just how much of the software they ship does / doesn't work with Wayland, because users file bug reports. At some point, they've decided that _this_ release is the cutover, Wayland is sufficient, e.g. there's only 20,000 open bugs against it compared to 80,000. I don't know the actual number or metrics they're using, but it worries me given how many things I know don't work for me, today which is why I use Xorg (not that I'm a paying Red Hat customer); they are not waiting for zero bugs and perfect compatibility with existing software before making it your only choice.