I understand the "Un-Photoshop" approach, and the general reasoning. It makes sense. I get it.
Yet I don't think they thought anything about "a flexible solution" in the UI.
There is nothing flexible about LR. There are plenty tools and over the revisions to add feature sets, yet nothing flexible to maximize the UI abilities.
On the contrary, I see it being restrictive and stiff. Taking away from technology/programming that is available.
The UI flexibility would not make it in anyway more like Photoshop than it would make it like Ai, InDesign, or like C1, or Corel Painter, or any program. UI is User Interface. LRinterface is LR. There isn't anything a user can do to help adapt it to the way one works... Well you could change a few colors and name badge. But this doesn't allow "mental ergonomic flexibility". (Understandably one of C1 marketing points they push).
UI is a core foundation of the way someone works, and hard to ignore no matter how adaptable a user is.
While I LOVE LR for MANY and most things, I have a gut feeling and doubt that 12 or so different industry professionals all thought LR should only have 1 screen usage, and that the tools should be locked as part of the view screen.
Obviously this changed over a couple versions... I forget, as I adopted LR as my main image app after v3-4. Did v1 have the limited dual screen feature?
If that is the situation, I have to say that obviously Mark Hamburg and Phil Clevenger didn't select a well rounded pool of photographers.
This is not to take away from everything that has been achieved, and all the excellent thought gone into it! My intention is simply constructive.(and this is something of an OPTION, NOT a change in the UI).
Just that an overall dynamic of the UI usability has been completely omitted. I say this as there are few professional shooters I now in photography, let alone commercial/studio/production work that use a single screen.
You can even see this outcome in another post of LuLa-folks/photographers that chimed in on dual screen usage. I know this is something I have brought up before, and I simply do so again...sometimes on the occasion that it applies. :-)