I do that, but the more complicated the meal, the less down time there is, and the more stuff there is you can’t clean up until the end.
Also, if you use serving dishes, rather than just serve out of the pot / pan, that’s another thing to clean. It’s true that cleaning a pot or pan is normally a bit harder than a serving dish. But, IMO the extra bit to clean means it’s not worth it.
It is a bit of a triumph when the only thing to clean after dinner is a single pot or pan though. And, pro-tip, you can make the pans easier to clean after dinner if you dump a bit of water in them as you’re sitting down to eat. Even 30 minutes is enough to turn the remains of a delicious sauce into sludge at the bottom of the pan. But, soaking while you eat makes it super quick to scrape it out afterwards.
An upscale but retro-themed gaming cafe would probably do well in a big enough city.
Like, instead of selling only Red Bull (but do sell that too) sell quality espresso. Instead of just instant Ramen (but do sell that too), sell Japanese-restaurant style Ramen. Charge a fair price for that, heck overcharge for it. It’s a bit like a movie theatre, but you’re getting quality goods not just popcorn.
You could also do well with the kinds of setups that most people can’t have at home because of space / time constraints. Like a proper VR setup with the space you actually need to take advantage of it. A Flight Sim cockpit with a good HOTAS setup. A racing setup with pedals and stick. Also, just simple stuff like couches in front of a big screen for playing console games together. Even people who have a couch, big TV and good console at home probably don’t get to have their pals over for gaming sessions much because they need to share the couch with spouses and kids.
Also, have lockers on-site people can rent out to store consoles, peripherals, etc. So, someone can come in, rent out a “booth”, and go get their gear out of the locker if there are specialty things they want that aren’t provided by the cafe.