Is the native “Device Groups” function really only available via (mobile) app?
Or am I missing something here?
I can create various “Device Groups” on my tablet & phone but not via web-browser.
On top of that the created groups can’t be modified via browser even though visible.
Is this function really ready for release??
Yes, as indicated in the support article on Managing Device Groups:
At some point Athom needs to start making a webpage explaining which features are available where, because it’s becoming a bit ridiculous.
Well, that’s too bad. 
So creating the UI on a platform where it’s easier to manage and maintain and have an overview “Device Groups” is not gonna happen then?
And how the h**l are people supposed to know what features are available where??
No offence but this is going to be a total mess. 
Don’t shoot the messenger 
.
What might help is to report it to Athom’ support desk at https://homey.app/support. The more of such formal requests they get, the more attention/priority it gets on their end. Similar as for other functionalities, like Dashboards or Energy, which are also not available in the web app.
I agree though, that it can become quite a puzzle to determine which interface to use for what functionality.
Heck yes!
The interface shouldn’t be the limit.
Regardless of from what device You’re working, You should be able to manage the device.
Not “this from here and that from there…” 
No, pull up Your pants Homey Dev team, start over and re-work the management landscape.
Especially when You can use the “< GROUP >” app from all interfaces.
Well, Emile actually pointed to that particular app in case you want/need more than the (very limited) group function can offer
I’m using the < GROUP > app today.
It’s just sad that HOMEY dev team is allowed to increase fragmentation of the application by separation functionality to different platforms.
IMHO the web interface is (and should be) the common interface regardless of OS.
Just my 5 cents!
