Kind of get it with UE but it's just an option of many, games are too expensive now, players demand even more and better, yet you still see many devs out there making their own engines because of whatever reasons (like Asobo), the problem is not using UE or Unity, but what's worse for the business and players, like that Telltale Games engine they didn't want to get rid of.
BTW, most consoles using PC architecture is the best thing since 8th gen, that means only good things for devs and players since games aren't unnecessarily harder or more expensive to make.
I don't get how very custom hardware architecture is a good thing for anyone, it's simply going the full retard path at this point, imagine if Nintendo or PS ditched shader based graphics computing for their own in house tech... They'd get barely any game from third parties.