As of 22611 (Git master) self-build on Windows 10 using 150% scaling, it's looking lovely!
Fix a point onto an object constraint tool - Now Good! Thank you, Vanuan!
Create a line in the sketch tool also creating a constraint - Still Good
At least for the Sketcher workbench...
Draft workbench endpoint snap cursor: no apparent change. Not sure if that workbench is part of the effort undertaken in this thread.