I'm actually quite gutted we've lost M+C conversion manufacturers, I didn't use them often but they had their uses - If i had a major surplus of a certain resource say metal, and I'd just lost my three raid starships, I might enable all of them for a quick boost of crystal to really get the production going (maybe this was a placebo affect though?) It just seemed if you stacked engineers on a constructor and enabled the converters all at once that resource would see a significant boost and then drop rapidly again as they were quickly used up.
I guess this was a somewhat rare occurrence but in times of need it seemed to save my skin if i needed a lot of a particular res quickly. Would be very interested to know if it was all in my head though haha
(I like being in control of my economy)
EDIT: Reading the more detailed patch notes though, all should hopefully be OK if the hamsters work as they are supposed to