I see the humor in that (for some of their products)...but my ER12 has been completely stable and reliable, very happy w/it.
It's definitely a tweaker's playground, via CLI more that GUI, and I had a learining curve to get a handle some parts of what I bought it for (VLANs/IoT isolation, WireGuard VPN, etc.). The forum can be very helpful, lots of seriously skilled networking people there.
LOVE their AP - I have a NanoHD AP and it covers my entire house and outside where before I always needed multiple units to make it work.
Seems like EdgeRouter line is getting pushed to the side going forward due to other prioritites, like the new UNMS product line (WISP focus). It feels like EdgeRouter line will get squeezed for resources in the future, so I'm not as bullish on the future of EdgeRouter as I might have been. And agree very much that from what I've read the UDM line has been very problemmatic due to serious and long-lasting FW issues.
Overall I've been very happy w/my setup (ER12+NanoHD AP) but obviously it's a very simple config and I haven't had to deal w/potential issues that multi-AP installs can bring.
One thing I forgot to mention, Unifi APs require a controller, either on their hardware controller, or many run the controller like I do on a Pi - it's required for all config, FW updates, maintenance, etc. ER line has pretty robust GUI, but you can do anything you want in the CLI. (Good and bad...ask me how I know. ) ER line and Unifi line are separate - they can and do work together very well, but you manage the Unify APs from the Unify controller, and the ER from its GUI or CLI, and to some extext from the UNMS controller. It's a little odd...