IMHO, GM had to migrate to a mid-engine design because that's where all the world class hyper cars were and this is a global market.
The upside is that GM has the engineering resources to design and build a quality car at a bargain price, compared to its competitors. But never forget that Detroit led the world in front engine/rear drive performance vehicles, such as C1/7 Corvettes and Shelby Mustangs. One reason, I believe, is the OHV V8. For decades, "sophisticated" enthusiasts would tsk tsk OHV engines compared to OHC configurations. But the C8 has the LT2 that delivers world class performance. That's because over the decades, Detroit refined V8s that delivered power and were daily driver durable.
Yeah, there's rumored a DOHC V8 down the road, but I'll take the OHV engine. It maybe old school, but it's very refined old school.