Jason previously stated in mailing list (couldn't find the thread now) that obfuscation is not a goal of WireGuard.
Unless you mean WireGuard over Shadowsocks UDP transport, but that is even less common.
(Disclaimer: I wrote the official Go port of Shadowsocks https://github.com/shadowsocks/go-shadowsocks2)
Sometimes a bad solution is better than no solution at all.
Tunneling WG over SS would be inefficient for obvious reasons. Maybe there should be a more lightweight solution.