I don’t think that they don’t know about these problems but still they go through with it because there is always a workaround the only problem with it is that you either have to do a lot of work for it to be the you want or it comes with options like take this or that you can’t have both.
Honestly i don’t know why they made lumen standard for lighting, UE4 by the end was working really good but the moment they introduced UE5.4 lumen with kind of integrated raytracing, there have been so many problems, even though its a huge jump in visuals yes but optimization is way way bad or just takes a lots of time or high hardware power to work with.
Even though community have been complaining about optimization but still Epic is doing what they want.