A colourless Titan would be interesting but as always I think of the lower level players.
Currently they can at least pick a mono team and hope for a bit of board luck and get lots of tiles into the weak spot and at least get a decent score.
Take that away and suddenly colourless titans would become pretty hated.
As usual the top of the tree won’t have any issues, it just lets us pick the very strongest team we have and hammer it anyway. But your lower players you may be fairly new or being very disciplined and slow playing F2P aren’t going to have that luxury.
What I actually very much liked about the Mythic was the different difficulty levels. When I was 6 months in I’d not have been able to stand for long in the top difficultly so having those options meant I’d have been able to enjoy the content still.
So a colourless Mythic I could get behind as a one in 6 rotation for something different