You're essentially right.... It's only a couple of minor points I can pick you up on, and it feels like I'm nit-picking....
Naming consistency and using a prefix for a room.... YES!!! My OCD dictates I must at least aim for this... My laziness means I don't always achieve it, but kick myself when it brings me undone... 
But seriously... it can be incredibly useful, both in providing information within the name of device and when sorting them in a list, as you describe.
That said.... This, even with the built-in Rooms listing of devices, does not provide the Apps associated with a Room, which is a major part of what I was looking to add to the mix, so I can easily bring together the automations and devices involved in a Room (but not just rooms... more on that in a minute). Sounds like I am trying to shout down good advice, and that is not what I am looking to do, all your suggestions are entirely valid and useful tips that I would suggest people adopt alongside what I am proposing, it may even be part of the smarts I look to use...
The Grid layout was part of what I was aiming for in terms of a general UI.... Well spotted...
I'd only add "not enough" to the end of that.... It has been discussed a few times in my time here... But can understand if it get's lost in the long list of topics over that time.
So, in addition to bringing together devices and apps utilised in a Room, I am also looking to provide a way to group things that the user sees as related, for whatever reason. So you could have a "layout" showing devices involved in Study Lighting as I did, but some of those same devices may also be involved in another "layout" relating to the Hallway directly outside my Study, or in whatever other grouping you may want, unrelated to the Room they belong to.
But yes, there are some built-in features or methods people can adopt to achieve part of what I am trying to do here. Hopefully I can bring some additional value... one day 
