hardops can be little hard to get into, still wouldn’t say i’m totally comfortable with it. but slowly starting to understand how it operates.
maybe main thing for me was when realised that it expands blenders built-in things and makes them behind one or two clicks. like c-sharpen, which basically adds bevel modifier, marks the sharp edges and you are done. you then adjust the amount of bevel and have nice rounded corners. However, this doesn’t make the normal polymodeling away, if you need to add geometry to get the shape you should do that and not rely on the bevel modifier ot bring the shape. basically it takes away the time consuming parts of assigning sharp edges and manually adjusting the crease amount etc.
boxcutter is simply awesome. though might require cleaning up after hard booleans(no pun intented). for me personally its sped up my concepting alot.