I have similar feelings about #GeoGebra. It does amazing things, but I find the UI for coding glitchy and hard to use. GeoGebra is in its 6th or so iteration ,so I assume the problem is lack of personpower.
Unlike GIMP/PS, there’s no replacement, even a paid one, that does all the amazing things GeoGebra does. I admire the people who developed it (AFAIK, it was invented by just one person as a master’s degree project!)