Mobile games are the equivalent of those "100 great games pack"-type CDROMS you'd find in the electronics section of stores in the late 90s/early 2000s. Not many invest serious money and time into gaming on a tablet or phone like they do on a console or PC, because games on phones and tablets are more like an afterthought. Something to do in between group chats and work emails.
Same here. My favorite game is Kerbal Space Program, and the graphics look like they are straight out of the early 2000s, but even with a 12 core CPU I still get crazy lag during explosions, staging, and other physics interactions. Transitioning from "on rails" flight to actually modelling physics when within a few km of something else has also not ever been smooth.