There are still threads not beeing commented/answer in anyway. (I as well as others have posted issues about the heating mode troubble on the Nest Hub not working, but working fine using the Google Home app). Its quite frustrating when there simple isnt any respons at all. Maybe this isnt a openhab issue at all. But without any answers, no one knows.
Ofcouse we are aware of this. I believe this is why Gytis raise this problem.
This is the most important problem to try to handle in an open source project maintained by volunteers.
When an serious feature seems to be abandonded its important to place a focuse on the matter and try get someone else to continue. We cant know if Marzima have abandonded the integration. But when things arent moving in development, we´ll have to assume he has. And then try someone to catch it and continue.
In my opinion it is a highly serious matter, cause I believe the integration of voice control (wether it beeing Google, Alexa are anything else) is highly important for a smarthome system.