In my projects I often set-out urban streets, footpaths or landscaping (eg lawns, retaining walls). These need to adopt a mininum radius (horizontal and/or vertical). These use linked arcs (then an offset to create the other side).
There’s an element of design creativity to this process, eg following a stream edge, or going around a tree, or tracing over a topographical contour line.
I’ve also done modelling in the past that showing pipework, cables, or fencing & balustrades etc, which also use a minimum radius as a key input to the process.
I’ve actually never used bulge - can’t even think what that could be useful for.
I like the simplicity of the arc tool & so don’t want to add a lot of complexity. My favoured approach is for Sketchup to just report on the radius while it is being drawn (using the measurements bar).
A nice addition could be to specify a precise or a minimum radius prior to drawing it… John pointed out that you can type r before the number - I didnt even know that so will try that next.
& Yes I do use all the 3-point arc tools and what Box shows with the chamfer radius (@box it still works if it’s not a tangent (magenta) arc)