This is an example of a tricky situation which we have all discussed before. It has lasted for several years now, and it is not conducive to the uptake of Manifold 9 by third-party developers who would like to build extensions.
Taking the present example, I would love to write a decent add-in to perform the equivalent of Paste as Surface, with no interpolation, for 9. A "naive and wasteful" version (as Adam beautifully put it) would take no time at all--but there would be regret in doing that, when an efficient version (which would do everyone including Manifold much greater credit) is not so much harder.
Not much harder, but just enough extra time that it doesn't feel fair for it to be (necessarily) free, when the time would obviously be deducted from other work.
Some clients might hesitate to pay a fair price for a function that might well appear as a built-in, for free and certainly faster, any day now, or next week, or next month. In three or four months--that might be different.
But we just don't know which month it might be. It is difficult to make a rational investment in this situation, with no roadmap. As I said at the start, the situation has gone on for a some time.
I don't know how to solve it. Having said which, the last time I brought it up the hearing was very sympathetic.