>>943832
>there's no collision detection to tell a vertex "no you can't go there"
Define "no you can't go there". How precise the solution for a problem is going to be depends on how precisely you were able to define the problem.
With manual vertex editing, nobody to my knowledge has ever been able to precisely define the set of rules by which the software should decide if a vertex can "go there" or not.
Consider for example that only watertight meshes have an inside and an outside. But there would hundreds upon hundreds of special cases to consider.
To some extent it's not even clear what a "valid" mesh even is. Do you consider self intersecting geometry invalid even if it renders correctly?
And the list goes on but it's just to show what a dead end manual vertex editing really is.

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Imagine how much better vertex modelling software could be if it was made as intuitive and user-friendly as CAD, instead of just constantly adding…