Yes, the new features of the engine do require a more powerful PC. Epic is pushing the technology because fully dynamic lighting is something that’s extremely useful and improves both the game itself and makes it faster to build the games since you can immediately see your lighting and don’t have to wait hours for lighting to build. It also means you don’t have to deal with lightmap UV’s which is great.
When UE4 came out they had a different dynamic GI system they had to pull from the engine because it couldn’t run on consoles. Now we have a solution that works on the current generation of consoles but it does mean that a range of PC’s won’t be able to benefit from it, but that’s necessary to push things forward. In the meantime, you can still use the old lighting systems if you wish.