“The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair."
HA MoT has a simplified UI, that hides hellish complexity underneath, that's held together by loose pieces of gum, which means its difficult to troubleshoot. HA has a rather laissez faire policy to stability, for example, they rolled out an update just recently that made it impossible to add new devices.
I just readded yday evening my Ikea temp sensors as they mysteriously stopped working for no reason. Why? Who knows, but you can't ship stuff like this to a non-technical audience, especially if they rely on it. I had it connected as the temp sensor of my AC, and was surprised to find the AC was not working, thats how I found out it suicided itself.
Automatic updates in Home Assistant are disabled by default for a reason. It’s not an ultra polished, safe corporate environment for non technical wives and children.
Which sensor? Battery powered temp/humidity sensor or USB-C powered air quality monitor? I’m asking because the battery powered one is known to be bad. They disconnect and refuse to connect again until their batteries are pulled for ~10 seconds. It’s a device problem, not Thread problem.
If you limit your pool of zigbee devices to just more reputable companies, you'll end up with around the same amount of options as zwave and they'll be reliable but significantly cheaper.
You also have the option to find some super cheap stuff that works just fine. That usually requires some research but not much. You can also build ESPHome devices for zigbee but that's pretty niche, to say the least.
Having previously been all zwave then moved and tried to go matter but ended up with zigbee, I wish I never listened to people saying what you are. As far as I'm concerned, zwave doesn't know it's dead yet and Matter isn't going to fulfill it's promises because the corporate interests that wouldn't give you local control with zigbee aren't suddenly going to change their minds because it says matter now.