The situation you present, Drew, is a classic one, where developers (or building end users) and fire service do not get directly together until after the building control body has issued a completion notice and the building becomes occupied.
The developers/building end users usually want, amongst other things, a building that the fire service are happy with (i.e one that meets B1 to B5 as well as being capable of offering a safe environment under the RR(FS)O - one that will not require further work after completion!)
But the people in the middle (the designers, approved inspectors and fire engineers) often appear to have a slightly different agenda, one that will push the limits of fire safety. This means that there is often a situation at design/construction phase where the fire service are not happy with the design but where the building is being being built anyway - and the developers/building end users are blissfully unaware that the building may run into problems when the building is occupied and responsibility for enforcing fire safety in the building passes to the fire service.
There have been a number of cases around the country where the fire service have issued a prohibition notice the day the brand new building has been occupied.
I always encourage FRS fire safety officers to try to ensure that any concerns they have reach the developers/building end users, but this is not always easy. The building control body are advised that they should pass on all FRS comments but this does not always happen.
I have to balance my comments above by saying, quite truthfully, that there are good designers, fire engineers and, yes, even AIs out there who manage very successfully to combine innovative design with good safety levels, through a policy of open-ness, clarity and good communications.
Good luck with your cause,
Stu