Maybe with the power of a supercomputer, Mathematica can finally launch in less than 30s. I have no idea how a software that still does essentially the same thing as it did in 1988 can be that sluggish.
I think it's an extreme example of not-invented-here syndrome. In many ways that leads to interesting novelties, and in others it leads to not having undo/redo until the 2010s.
Yet there is hardly any computing system that can replicate Mathematica tooling capabilities.
One would expect 37 years would be enough to create such alternative.
Jupiter notebooks aren't the same.