I have an old Roomba that doesn’t have wireless connectivity, except infra-red. They don’t build them like that any more. All new models have bluetooth and wifi, no matter if you use that, or not. They will drive around with that extra hardware, maybe even supply it with power, even if you just use the hardware buttons to control it.

Some ppl are paranoid about someone remote hacking their Roomba. I doubt it’s possible, but still it’s priceless to have a “dumb” one.