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ChatGPT tells a lot of nonsens when days are long, but in point 1 it is right with the orange: That is in fact the complimentary contrast colour for blue. I don't agree with the idea to differentiate partly and unconstrained curves with more colour tones. How many subtle tones does it take to visualize a curve with 26 vertices gradually becoming fully constrained? An entity is either fully constrained or not. It is not that we have too few shades of constraints, it is just that we cannot spot the important one.

So I'd agree with ChatGPT to highlight that one, EG like I outlined above. It causes no clutter and is simple and effective.

I agree 1000%. It's especially painful if it's an unconstrained endpoint under one that is. One thing that sometimes helps is to switch - even temporarily - to dark mode. The contrast with the dark mode colors is a little better.

In my opinion, any unconstrained end point or vertice is pretty close to a "serious issue" or on it's way to become one any time. I see no reason not to use a more alerting mark for these. Since sketch vertices can exist on top of each other, it might be worth while thinking of always displaying unconstrained vertices on top of others AND giving an unconstrained one a red halo, do it shines out even if obscured by something else on top of it.

Also, as can be seen in the above screen shots, a blue point on a light blue backgrund (the plane, which typically goes along with a sketch) reduces contrast even more and the combination is certainly a bad choice.