Assuming this is still the case:
If the repair cost is 75% of the total cost, and rebuilding on a wreck costs only 50%, then if a unit is damaged beyond 66%, is it more efficient to ctrl+k it and rebuild on the wreck?
(If there is 33% health left, 75% of the 66% to heal is 50%, the same cost as rebuilding on the wreck)
Can someone explain to me (using numbers—here are the unit stats for your convenience) the supposed "trick" the pros do where they ctrl+k a t2 mex then rebuild a t3 in its place? A t2 mex has its own build power, and produces mass as it's upgrading so it seems like it would be faster to upgrade the t2 mex than to rebuild from scratch using only the build power of the surrounding engies.