We kind of have that already with the Customization > Theme grid layout of thumbnails.
So yes is doable of sorts.. Could even have a description pop up maybe if used an idea of short press/long press or single/double tap.
How useable ppl might find it may delend on application. Tbh I find the Customization > Theme topic list annoying on mobile as I find it harder to visually find things.
But of the Op has a more Simplified Category names Icons with Text under them might do Alrighht.
How many Categories are you talking? See my post above and checkout the Customization > Theme link for topic layout with rhumbnails.
Indeed. lol
I can see it being a inevitable that someone will likely create a Customization > Theme component or possibly a Customization > Plugin depending what alm is needed t9 acheive a desired effect.