I guess you can call it an issue but it stops being "smart". As in, no special "AI" to decide when to heat etc. You have to program it yourself. Or hook it up

I guess you can call it an issue but it stops being "smart". As in, no special "AI" to decide when to heat etc. You have to program it yourself. Or hook it up to HA and send the on/off commands as you wish. As for HA, there's really no dedicated service or add-on for Hive. But the generic thermostat service is good enough. I combine the scheduled heating in Hive with "on-demand" through HA when needed.