This isn't about building software similar to what we currently have and just making it more end user configurable. This is about rethinking software so that end user malleability makes sense.

What does such software even look like? We want some kind of end user modifiable artifacts, still contained within some constrained substrate. Think Minecraft or Excel - I can give you a spreadsheet to calculate some taxes, but you can then dig in, change the formulae, remix with other sheets, and so on. Most software is not like this - typically you get some pre canned views and switches, not a canvas of composition.