An example - I create detailed residential models, in some cases showing individual 3D cedar shakes on walls. Where shakes populate a rake face, they trim to the edge of the roof slope. This creates innumerable shards of shake material that has to be carefully trimmed so as not to protrude above the roof slope, which is never orthogonal.
Another example - I build a detailed stone wall and then cut it to suit certain design constraints, which could easily be non orthogonal. I am left with broken pieces of rock that have to be hand gathered with a selection box tool.
The real world is just often comprised of non-orthogonal design drivers, and I am just asking for a selection tool that is flexible enough and fluid enough to keep up with the pace of imagination.
Does the Vertex Tools selection tool work on non-quad geometry?