At the present time there are some Fibaro products that work well with SmartThings and some don’t, in spite of all being Zwave certified to the independent third party standard.
While many smartthings customers are angry about this and blame Fibaro, it’s honestly not their fault.
In spite of being a certified Z wave hub, smartthings has added its own abstraction layer to its platform so in order to get many devices (not just Fibaro) to work with a smartthings hub you have to use “custom code“ written specifically for the smartthings system.
Smartthings now expects the device manufacturers to provide this code, or customers to write it for themselves. Samsung does not provide it anymore.
All of which means a device manufacturer might, as Fibaro does, get their devices certified to the independent third-party standard but then find out from customers that there is additional special code needed to make the device work with smartthings.
Even worse, smartthings can and does change the custom code requirements from time to time, which causes devices that have been working just fine to stop working.
So the device manufacturer has three choices.
Like Zooz and Inovelli, they might create special smartthings code and make it available for their customers so that their devices will work with a smartthings account.
like Fibaro and Fortrezz , they might say “our devices are certified to the independent third-party standard. If special code is required by a particular hub, you will have to talk to that hub manufacturer about it, we do not provide it.“
or they might just say they don’t know anything about any special requirements, it’s a Z wave device which should work with a Z wave hub. Which honestly should be true, but it is smartthings which has made it not true for their own particular platform.
Of course all of this can get very frustrating for the individual customer. You can see how weird the fact that smartthings has this additional abstraction layer is because Aeotec is now their partner for selling hubs. But some individual Aeotec device models like the Walmote quad work better with hubs from other brands. Wallmote has 16 functions with a hub from vera or Hubitat or Homeseer even Fibaro— there’s only eight functions with a smartthings hub. Because of the smartthings-specific abstraction layer.
Fibaro Devices work just fine with other Z wave hubs. Some of them work OK with a smartthings hub but may require custom code and some of them don’t work at all with the smartthings hub. But Fibaro has made the decision that they themselves are not going to provide any special code required for a hub-specific abstraction layer.
So at the present time it’s easier to recommend one of the other manufacturers that is providing the special code needed.
p.s. The posts that are missing, as @orangebucket noted, are probably mostly from one very active user Who had done two entire houses with Fibaro kit and smartthings but then chose to move onto a different brand of hub (which didn’t have the special code requirements). All of those posts are out of date now, anyway, because changes that smartthings has made to its platform in 2019 and 2020 meant the Fibaro devices Which had been working stopped working with SmartThings. They still work fine with other Z wave certified hubs, though.