Actually without lumen you would have shadows that might break if you moved a chair. The shadows would remain there even if the chair was elsewhere.
Hardware Lumen corrects this and allows devs to have breakable environments and objects that they couldnt do due to baked techniques.
Who knows what the future holds but i was very disappointed when UE5 games simply ignored the chaos physics Epic had demo'd in the matrix demo. The engine has support for this ever since UE4. Devs just dont want this shit in their games.
Notice how the cars that get nicked by my car have accurate physics applied to them even after the initial collision with my car. They move and get stopped by the polls behind them. Some even have their windows and headlights break.
And this was before they integrated nanite to their collision engine.
Some more pics: