UE5 is just a tool. Developers are the ones who are responsible of the game performance, more than Epic.
There are some problems that plague UE5 games like transition stuttering (moving from one zone to another) among other things, but overall I couldn’t blame the engine when the ones who use it are not me, but the developers themselves.
Same flak for Rocksteady and Batman Arkham Knight. They used Unreal Engine 3 instead of 4, and ran like crap anyway.
Studios and publishers will happily pay UE fees if that means pushing the game on schedule than wasting 2 years creating an engine from scratch that can’t resell or reuse (there are exceptions , tho)
Basically, US is an extortionate country. At least it has become one thanks to piss hair.
“If you give money to an extortionist, they will come back for more”
It’s not a negotiation and Japan, as any other country in the world, should not give in.