UHD option is to increase the resolution of the objects. What I was talking about has nothing to do with the UHD.
The soft edge cast shadows, along with the special effects like vigette, atmosphere lighting, bloom, lower depth of field… can make games more immersive when we play ACT or RPG like Octopath Traveller. But in a RTS like Age of Empires, the people may want to recognize objects easier. Adding special effects slighty is good. But if they are overused to make graphics blurry, people might feel uncomfotable when they are recogizing objects.
We already have these amazing details of the new models and gorgerous collapsing animation so I am not sure we need more effects to decorate them. I am not saying these effects are bad. But maybe we should find a better balance. We can disable most of the special effects in the option menu. So I guess the main problem is the cast shadows.