I really like your approach for fitting pre-built topology, that’s definitely something Blender is missing.
I think we need to distinguish between 3 types of retopology, as they get mixed up way too often in conversations like these.
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Automatic, which can be used for mid/background models not requiring a sophisticated topology. Zremesher/ the upcoming Quadremesher is about as good as it can get currently.
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Manual, like Retopoflow, Topogun, 3DCoat, Nex/Maya tools etc. Can have fun tools. Mostly used for important models requiring a specific edgeflow/topology for good deformations, shape keys. I personally prefer something simple. PolyQuilt would be a good start, one tool to create quads, add cuts, loops, extrude edges, edgeloops, tweak and relax without the need to switch tools.
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Wrapped - like R3DS Wrap, deforming pre-built topology onto different scans. Got 100 character scans, need to use the same topology, weights, UV’s etc.? This is the way to go most times in production.
All of the above are used in production on a daily basis, currently Blender 2.80/2.81 doesn’t have any of them, so again, thank you for all your effort!