I love my unifi setup at home. Yes some more configuration for sure, but once it's up, it's so rock solid. Compared to the Asus router I had before the wifi reliability is fantastic
The best mesh network though would be through a smoke alarm setup. Then you could do backhaul over the power line and then you'd have WiFi everywhere. It would work really well for newer construction where hard wired smoke alarms are mandatory.
Argh, please don't proliferate ethernet over power lines. They cause horrible RFI by turning every unshielded power line into a broadband antenna[1].
[1] https://www.rtl-sdr.com/showing-the-hf-interference-problem-...