Most people don't want to do anything 'interesting'. If you stray too far from the beaten path, I'd argue that you no longer need or something that "Just Works". You need something very configurable, which, by definition, will let you shoot yourself in the foot.
My current setup is Mikrotik for wired and Ubiquity APs for wifi. Their wifi devices have great specs and are difficult to beat. Mikrotik has decent wifi devices but not only they have a footgun minefield - not exactly their fault since Wifi is difficult to get right, so the more settings you expose, the worse it gets. Mikrotik also logs behind in features (they are still at wifi 6). It's an odd combination of philosophies but seems to work, all the vlan logic is offloaded to Mikrotik. And so are firewalls, etc. Then the voodoo Wifi stuff gets handled by Ubiquiti.
> Want to change a WiFi setting without WiFi going down for a minute or two? Good luck — UniFi doesn’t seem to care about making it work.
I am with you on that. It's things like that that prevent adoption by larger businesses and contribute to the perception that they aren't a serious contender. I previously had an Aruba InstantOn setup(which is focused on SMB), and got really accustomed to being able to tweak (most) settings without any interruptions at all. I could even do things like change channel widths (in one direction) without losing connectivity. What was really surprising on Unifi is that I lost connection when I changed settings for a _different_ SSID, for like a minute. That isn't really acceptable.
They still do a lot of things right though, and it shouldn't be too difficult to get their act together. The devices are pretty decent and at a surprisingly low price point.