Is this not the case because you have Unifi gear with a central controller much like how mesh systems work with a master?
I don't know how these really work I just use the stuff, so it's a genuine question rather than an argumentative one in case some one gets the wrong end of the stick on my question.
The controller simply provisions (programs) each device on the network so they all work together. Unless you want to make a configuration change the controller is not required. Each access point is cabled back to the device that does the routing.
The difference between a mesh and an access point system is the access points are cabled directly and the mesh units connect wirelessly. They’re called mesh because they constantly look for the node that gives them the fastest route back to the device that does the routing. This is not necessarily the closest one as they’re constantly juggling bandwidth.
If a cable gives you 1Gbps and a decent WiFi connection gives you 600Mbps it doesn’t take a genius to see that the access point solution will be better.
Then take that 600Mbps and you have two types of mesh. The ones with dedicated wireless backhaul and the ones without. Dedicated wireless backhaul gives you a 600Mbps connection back to the device that does the routing and the other take your 600Mbps and split it so now you have a 300Mbps connection at best. And that 600Mbps is in perfect conditions. Generally you won’t get perfect conditions.
Mesh units with cabled backhaul are access points.
The take home message is that cable is (currently) always fastest. Direct cabled access points next fastest then mesh with dedicated backhaul and then mesh with split backhaul.
Ironically, wired access points are generally the cheapest solution but people don‘t want the disruption that installing the cabling involves so they start off on the cheapest non-disruptive solution then that’s rubbish they spend more on a supposedly better non-disruptive solution until they’re spending £1000+ on an Orbi system. To be fair, Orbi does a good job and it’s still slower than £5 worth of cable.
As long as the OP makes an informed decision then we have to leave that choice to them. If you go through the possibly hundreds of threads on this subject you‘ll not find anyone posting “I spent £500 having my attic cabled for a wireless access point and I regret it”. One or two upper floor ceiling mounted access points will generally give excellent coverage in a house built in the last 50 years. So you don’t need to rip up floorboards. And if you run the cable(s) externally there is surprisingly little disruption or mess.