You don't need to worry about putting in Sky Openings to get a decent amount of hits.
It handles large geometry and light sets better than MS.
Lighting is already simpler and once they add IES will be even easier.
When the scenes are not totally clean, the fil grain like noise that results is much more acceptable than the spotching in PT.
Objects are grounded while in MS you need godzillion of particles, and the consequential time increase, to do so, unelss you use RT Direct, with the implications that you know about.
One of the enviroment options is the lumens\sm that I have been asking Bentlely to change Ambient to for the last 5 years, so you can make sure that the scene always gets a minimum amount of light.
The material preview is much better, especially because you can set up your own preview scene. Another thing that I have been asking Bentley to do for so long that I can't even remember how long it has been.
You can already individually dim lights once you have the solution, and NL has already agreed to provide banking capability.
The camera works like a camera so the resulting brighness is a funciton of your lense settings, not the averaging out of the total scene illuminance..
Remember the argument against the way MS does it?? In MS if you have an unlit janitor closet your brightness is affected by it...
Internal lights behave like what we see when we look at them... You don't have to turn sun brightness to .001 to get them to not be woverwhelmed by the sun.
Lights support colour temperature, something else that has been on the MS render wich list for longer than I wish to remember.
When Collaborative is fixed, offices like yours and mine will have a great advantage and the current render times will become much less relevant.
Can't think of any thing else right now

Ciao