I run primarily AMD, so I"m in the Math projects mostly, the science projects are generally more suited to Nvidea. And as far as math projects go the WU's are reissued almost immediately and there is no science effected. And projects like Collatz doesn't use wingmen. The sieve software is self validating. It either is or isn't No point in the redundancy.
Moo is in a very similar situation.
Prime on the other hand, uses double redundancy two wingmen for each WU for validation. They will accept two but prefer three. But they are certifying prime numbers and before they expend the resources on testing specific numbers for primality, they need to make sure the results are accurate, and that means redundancy.
So I have no problem with dumping WU's when not needed although I would do it through reset rather than abort. On a reset the server is told you no longer have the WU's and will reissue them right away.
Works this way for the science projects also so no fears of holding up or disrupting anything.
This is why Reset is the preferred way of switching projects