I absolutely love SmartThings and especially WebCore which is a dream for home automation but it seems in the last year or two support from the community for devices has all but died.
There are mountains of cheap wifi devices on Amazon none of which anyone has built DTH integration for, or any way to link to these things outside of using IFFTTT.
On the other hand if you look at Homebridge there are integrations for all sorts that don’t exist in SmartThings - I have 4 or 5 devices working in Homekit now that have no SmartThings integration. I have to use a ton of virtual switches (and ironically homebridge itself to link SmartThings together with Homekit) to get any kind of Webcore control over these, and then i’m actually running Homekit automations at the same time to get them to work.
Have lots of people moved over to open source alternatives like HAB and Home-Assistant? It does seem like they also have a lot more custom integration written and there’s a way to use almost anything with them. I guess there is a bigger userbase for what is a few and open platform and in terms of Homekit, available to everyone with an iOS device.
I wish I was one of the clever minds that could write device handlers and i’d help out but it seems now any device I see on Amazon and two years ago i’d have definitely been able to include with no problem (Sonoff switches when they first came along even had their own ST firmware written for them) are just not to be found on here (eWelink integrations for instance, Neeo, Webos, Tahoma, all the cheap wifi sockets on Amazon.)