Each manufacturer seems to have their own little quirks you need to work around: one device only works well on 2.4 channel 1, another will aggressively roam to other access points (even though it and the ap are stationary, and the closest ap has < -60dbm signal). Even the most relatively well behaved modules will disconnect and reconnect constantly (average connection time is ~10 minutes to an hour, mind you the device is constantly connected to mains power). God forbid you enable any 802.11 extensions on the radio servicing those devices, then you’re really in for a world of hurt.
Then when you complain to the manufacturer, you get super helpful advice like “factory reset your router” and “open the following 28 ports through your nat gateway to our device” (sooooo… and if I have two of your devices, what then?). It’s a total shitshow.