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I can change the grid size on the fly. With snap to grid and I move to Y+1 and X+1 and left click to start a sketch operation I know I am where I want to be and not at Y+1.0015 and X+.990
But even if line snaps to grid, I would still add dimensions just to be sure (and in GD to get them into equation editor as parameters)
Before grid I would like to see actual line lenght, circle diameter and rectangle dimensions next to cursor while creating a sketch..
and maybe even toggle automatic dimensioning on so that you could just fix the dimensions allready in place and not need to use dimensioning tool afterwards?
I totally agree with your second point.
That said I'm with @S1mon, I've never actually had the need for a grid for parametric CAD (you are supposed to use dimensions and "hard" constraints rather than snapping to an arbitrary grid).
However if Onshape is going to be used by other users than just typical 3D CAD types and enough people are requesting it, who am I to say it shouldn't be available as an option!