Discussing with the ISY maintainer…
- Isy994 has not yet added support for removing devices
- Isy994 has not yet added support for removing devices via the UI. (There are only about 10 integrations that have so far). The delete option was only recently added and as there are 100s of integrations that haven’t implemented it yet, it might be a bit much to add it to all of them.
- It’s on my todo list but it’s not something I plan on adding soon
So for anyone else seeing this behavior, it is apparently expected…and reading other threads, the possibly best path is just to “hide” it by disabling it.
Apparently the “capability” now exists to delete a device and we just need to wait for the integration to implement it.