Okay, let’s assume that you are right, and we don’t need the same interface.

I still maintain that the feedback loop demonstrated in Bret Victor’s videos is _significantly_ quicker than anything you can achieve with any TeX engine in its current form.

Think of the part where he draws the fish. Or where he drags a slider. You need update rates of a few miliseconds, tops.

What we can achieve with TeX is in the order of seconds, at best — for simple documents.

I am definitely not convinced this lives up to Bret’s standards :-).