Hi,
After being absent from the openHAB scene for a few years (on account of running a home brew system based on MQTT, Node-RED, etc.) I am getting ready to dip my toe in the water again.
So far I have “installed” openHAB Release 3.0.0 M5 as a docker container, and I am playing around with it on the side to get a feel for the new concepts (my previous experience was with openHAB 2).
I must say my first impression was very good! I really like the way this is going.
I do have some observations, though, that I would like to share and hopefully get some feeback on.
The first two I feel may be some kind of error in the system, while the latter two are maybe more related to my lack of understanding of the concepts so far.
Observation 1
Main page (the one that you land on when accessing the Main UI)
At the bottom of the page, there are three tabs: Overview, Locations, Equipment and Properties
Unless I totally miss the point (no pun intended), these tabs are supposed to reflect the semantic model. In this case, I guess the “properties”-tab should be called “points”, or?
Observation 2
Aministration > Settings > Pages
I am unable to delete (remove) pages that I have created. When I select a page and click on Remove, I get a pop-up message saying “Removing page…” (or something similar) but this never disappears and consequently the UI is now blocked.
Observation 3
Aministration > Settings > Model
Is there a way to add a new top layer in the hiearchy? Let’s say I created my first location as House, and added sub-location for some floors, and then some rooms, etc. If I then reconsidered my concept,
and wanted to introduce a new top-level layer called “Indoor”, I don’t see a way to do this. Is this possible without recreating the entire model?
Similarily, if I wanted to move a sub-location (say a room) from one location to another location (say from the first floor to the second floor), is this possible? Disregarding the obvious fact that this would be a huge reconstruction project in my house, I think it could be a relevant thing to need to do while working on building up a model, 
Observation 4
Aministration > Settings > Items
It is not possible to chnage the name of an Item once it is created. This seems like a rather severe limitation of the system, and quite a deviation from what one was used to.
Is this a temporary shortcoming of the system, or something that will be kept as it is?