Thanks for starting this thread and drawing attention to an important aspect to make Ubuntu MATE more popular among graphic designers. @RSA91
I recently posted my problems with color management and the lack of settings in the control center. I don't know why there are no basic options for color-calibrating a screen.
I am also considering to get a Wacom tablet and I'd like to hear your current experiences in getting it to work in Ubuntu MATE. I recently tried elementary OS and they offer a Wacom tablet settings option in their control center, so this is something that you and Ubuntu MATE developers can look into. There are other reasons why I don't like to use elementary OS so for me to switch a distribution is not really an alternative. Ubuntu MATE is a very innovative project, so don't give up too soon and try to get more people on board.
The reason I like to use a tablet is to allow for automatic recognition of Chinese handwriting. This hopefully gives me an alternative to the limited Chinese language options available in Ubuntu MATE. Fcitx is not working properly. I'd also like to use a Wacom tablet for basic drawings and presentations.