No one is arguing for the removal of all elevators, or for the removal of all fire suppression or egress requirements. What I - and others - in this thread are asking is to carefully consider and balance the tradeoffs.
With great respect, I think we'll need to wind this exchange down, as I'm find your posts on this problematic, as in you're not reading what I'm writing and instead repeating talking points, and I'm rather irritated.
As for elevators, I think the reasoning is on even shakier ground. The argument I’m hearing is that we need two elevators the moment any building exceeds 4 floors because every ~30 years the elevator will have to be replaced, and there may be also be a failure along the way. To understand whether this proposed mitigation is reasonable, we need to understand how long it takes to replace an elevator and what the MTBF for elevators are. Then, ask if the installation and maintenance cost of adding this elevator is worth that. Also, does adding a second elevator make more sites unviable? Are you ok with losing 10 homes for that second elevator?
So I understand exactly how long it takes to replace an elevator, I just had this done in my building in the last 12 months. The answer was
six months for cab replacement, hoist replacement, and shaft rehabilitation.
Second, prior to that replacement, elevators in building were each, on average down 2 - 3x per year, for 1-3 days per occurrence.
That's about 7 days per year of no elevator service, every year, for many years. Outages have been longer in the past as well.
This also doesn't factor for an elevator being on service due to move-ins.
At any rate, to have an informed conversation about whether these changes should be considered or not we need to have an understanding of the trafeoffs. For example: if 2nd stairs were dropped, how many more houses would be built? If 2 elevators were required, how many sites would not be densified, or densified less? With some modeling we could decide what goals we want to prioritize.
While I agree we need to weigh trade-offs, there are trade-offs we do not need to weigh. We are not removing indoor plumbing to save money. We are not removing fire alarms to save money. and We should not trap people in or out of their units for days, weeks or months so we can build housing a bit cheaper. Its not a reasonable trade, at all, ever.
We can exclude people from some units entirely by doing 3-storey walk-ups, that's a trade, but one in which those w/mobility needs are not resident in a non-accessible structure.
But once you invite people to be in a structure, you must maintain that accessibility.
My goal is the number of homes, as opposed to requiring that every home in a development be accessible. (Again, I am in favor of requiring that at least one - if not two - floors of units should be fully accessible on new builds). But I understand that may not be where we land as a society.
My goal it to house everyone, in dignified, safe housing, and not to consider placing them at undue risk to hit a target.
I'm also not suggesting we make every SFH accessible or even a 3-storey walk-up, I'm suggesting that once you invite people to rely on an elevator, you can't deprive them of the elevator.