Can we have software render like this? https://floooh.github.io/visual6502remix/

Although mesmerizing to watch, there are so many steps being executed, and so many things happening at once, that the animation doesn't do more than convey how complex it really is. This is the problem i have with many animated/graphic approaches. Do they actually enhance understanding, or is it merely eye candy?

Depends. Quick filtering helps followed by viewing in the context. For me, productivity comes from bouncing between focus and awareness.

What I like is the fast 'cross cutting connection' light up on hover. Mostly I am chasing the connection between two sofware regions and something like that may work. The execution is fun to watch but when everything flickers you can't tell any patterns. What if everything didn't flicker though? Or if you had a way to only show you the executions that match a specific condition?

Watchpoints. When debugging, I usually need to focus in on one case, but I may not be sure upfront what that case may be. So it's nice to alternate between grouping, say, all the executions of a line of code together and then focusing on one suspicious one. For me the frustrating thing is that I'll imagine the manipulation of the possibility space of executions in my head, then be forced to slowly and crudely convert that into tools that my debugger can understand.