I think the metahumans are a compelling reason to look into unreal engine - to me, the most compelling reason I've seen. They look great! At least within what's available, they look great. But it would be overly optimistic to say they are a one-stop all-singing and all-dancing total replacement for everything everyone is doing in Daz and other products. They may become that over time, but they're not there yet.

Also, the hardware shortages are not restricted to NVidia GPUs. It's industry wide, includes all GPUs, and is spreading to SSDs and with increased prices on all associated components. When car companies can't get the chips they need to make their cars, it's a big problem!