One of the things that really disappoints me about computing is how GUI development is such a horrid treadmill of constant reinvention and total reboots with no overall cumulative progress. The Web is just now reinventing things with React and components that were perfected in several different desktop systems at different times. Something about UI development makes long term reuse and depth building impossible.

I think one factor is that good UI and UX is nearly always proprietary, so these great platforms get built but then ultimately die when the market moves on.