You don't have stone walls. And you haven't spent the last year working in a study that's located between two APs, where clients flip now and again and Zoom would tear down the connection.

Of course you could say: Does the house have to be designed that way? Do the APs have to be located where they are, is it really necessary to have that stone wall, is it necessary to put the study in the place where it is, is it necessary to have that noise insulation around the elevator? None of that is necessary, but some Mikrotik hardware was much cheaper than getting rid of a stone wall and more pleasant than having to hear it when the neighbours use the elevators.

If you've ever lived in a country where the houses are made primarily of stone, you'd definitely understand the need for it.

Yeah I have a 2' thick stone wall in the centre of my house (old exterior wall). I have an AP on either side of it as they penetrate the ceilings/floors above fine, but nothing is getting through that wall and maintaing good signal.

A 1920's stucco bungalow with chicken-wire in the walls pretty much acts like a faraday cage in every single room.

Or earthquake-proof reinforced concrete.

Just brick that's old enough will do it. Mine's something like 150 years old, and it's absolute murder to drill into, just incredibly hard, and it's either dense enough to act like stone, or it's absorbed enough moisture over the years to look like a faraday cage to wifi.

Yep, stupid L-shaped house where the inner curve is a damn Faraday Cage. NOTHING goes through.

If I'm in the living room and need to move to the other end of the house to get away from family-related noise, the device needs to roam between two APs.

Unifi handles this without any issues.

It's not about walking and talking, it's about sticky associations.

Even if you don't "need" roaming having more coverage lets you dial down the power on all of your APs, so you can get much closer to the theoretical maximum throughput.

4 floors, 150-year-old brick, random steel girders in annoying places, and a broadband line that comes into the building at almost the least convenient place possible. Yeah, I need roaming.

Also as long as you don't have big bags of attenuating water (people) moving between you and your AP you also funny need roaming.