They don't require a controller, though - I have a Unifi AP at home, it can be managed from an app on my phone, zero setup needed. But having a controller means

They don't require a controller, though - I have a Unifi AP at home, it can be managed from an app on my phone, zero setup needed. But having a controller means being able to push configuration changes to multiple devices at once etc. (which I don't need in a small house, but would be handy in an office). I also have a Mikrotik router, which is not 'friendly' compared to consumer routers, but can certainly do a lot more.