Revisiting some old ideas

Mikaya has 2 variations: a talents nav box (which is the one I'm against due to duplicates) and a standard nav box. Ignore the talent version (which there's only 1 of on mika's page) since that's the most problematic one of the two. That'd take care of the first 2 issues you have with it. Your 3rd point (not referring to your opinion on which skills to include, but the parts after it) would be counter-productive since it'd result in people having to navigate the navigation box, which is why I avoided mentioning tabs for the nav box to begin with.

As for the images show up on devices that have images disabled, it'd partly depend on the device. While it's true nothing else is really coded to be primarily mobile-friendly, there's also nothing else on the wiki that uses images instead of text for navigating pages at that level (look at the main page) aside from user templates, which are for personal use, and the skill tables (I only used icons for that since the icons are all the same size, while the names varied in length and would stretch the tables they were in). While it may be faster for you to recognize pictures, that's only because you're familiar with the images, and it depends on the person (I find it both easier and faster to read 1~2 words vs looking at a picture).