When they say they want to keep stairwells from getting blocked, it sounds like the building isn't designed to handle large-scale evacuation but I think a high rise should be designed so that every resident could potentially evacuate.
This is the third high rise/large residential complex fire in eight years and the second in around a year and 9 months. I don't think this classifies as rare anymore. I also think by the time they realize a fire can't be contained, it's too late for those living on the upper floors and this fire seems to have started on the outside, so there was no apartment to contain it in. (The BBC has a verified video of the beginning of the fire. You can't see much other than that it seems to have started on the outside and it made me wonder if the mesh and scaffolding served as some kind of chimney effect).
The way I see it is that evacuation procedures are designed to save lives. To me, that means they should be designed with "always expect the unexpected" in mind.
Maybe it's time to re-think evacuation procedures and take into consideration where the fire started?