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I know the workflow is quiet different but Rhino is popular, for example, with architecture crowd and their licenses are perpetual.

True, albeit the associated cost is firmly not in the “occasional use hobbyist” category.

E.g. my wife using youtube tutorials to teach herself digital drafting to plan our kitchen remodel (with actual dimensions).

Yes, I would love to have a 3D CAD problem for modeling a new deck or a raise garden bed but most of the tools are just way out of budget for that.