FWIW you can use a Roomba without an app. You... push the physical button on the robot, and voila. No app, no connection, still cleaning.
Sure you can't schedule cleaning but honestly unless you have a version that can empty it's own trash recipient and your house is always robot cleaning friendly (so... 0 cable on the way, chairs aside, etc) it's rarely a huge efficiency gain.
Honestly I feel like 10y/o there was a lot of hype around vacuuming robot but it didn't "explode" in popularity because it's not really such a big difference.