> For my needs unifi was worth it to not have to deal with OpenWRT again...
Amusingly, I was quite willing to put up with a day or two of tinkering and puzzling over the -occasionally godawful- docs to never have to deal with Unfi and the rest of UBNT's software ever again. Even my recent move from my OpenWRT-"powered" UAP-LR/LITE to my OpenWRT Ones required only a little bit of fussing with the configs I copied over from the -LR and -LITE... and that was because of the difference in device names between the UBNT hardware and the One hardware.
What about the radio/antenna quality? I have a UniFi U6 Pro and it covers my whole house (~3000 sqft, 2-story) providing nearly gigabit WiFi speed everywhere to my WiFi 6 devices. I don't know how much the radio/antenna helps (4x4, 6 spatial streams) but I don't see how the OpenWRT One would be an improvement besides its hackability.
For my needs unifi was worth it to not have to deal with OpenWRT again, or worse, stock firmware on consumer APs.