In message , at 10:53:23 on Wed, 21 Jun
2017, "Dave Plowman (News)" remarked:

accommated the largest number of people on the smallest land area. If
you're going to mess with that ratio by removing rooms and adding
stairwells, a re-think of the whole thing might be better.

better than condemning the whole block

Not so sure about that. The original block was built in a particular way
to contain any fire to a small area. It seems to have been updating work
which was the cause of this disaster. Even more major updating to include
a second internal staircase might well create as many problems as it is
meant to solve.
Better to demolish and start again.

They probably will demolish the block that caught fire, so we are
discussing here some unquantified subset of the 4000 other residential
tower blocks in the country.

But two stairwells filled with killer smoke ain't going to help much
either.

Which is why they should be vented. And perhaps stiffer firedoors.

One properly protected stairwell and we'd not have had this appalling
outcome.

What do you think would have protected it better? (Genuine question, not
a devils advocate).

That, to me, is the important part any investigation has to
explain. An escape route is the last resort which is by far more important
than any other.

Adding a second staircase with the same woeful disregard for making it
conform to what is already common knowledge is simply throwing good money
after bad.

Why assume here was any woeful disregard in the design of the first
staircase?

--
Roland Perry