It's a much less mature equivalent to HA but with a drastically better UX/UI. I have tried to use HA several times over the past 4 years and imo it is an awful user experience with a big learning curve.

Webthings is beautifully simple and just works but it's also immature and constrainted compared to HA.

For my needs, controlling some Bali Z-Wave blinds, it works perfectly though.