p--and--t
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Steel is quicker/cheaper on the labour front. Don't have all the carpenter time in straightening the walls out. Rarely is timber perfectly straight and a lot of time usually goes in to packing/planing before plaster goes on. None
Blocking out for TV's is normal regardless of steel or timber frame.
There is also a difference between structural steel framing (looks like being used here as it supports the roof) and lightweight steel gauge framing (often used in apartment construction where concrete is the structural component).
Just as easy to screw something in to steel as timber, just need the right screws.
I think a lot of people would be surprised at what is (not) behind their walls & ceilings in apartment buildings. I've had a look at ours. the walls are held up by very thin aluminium strips spaced a fair way apart and a few screws. The ceiling is hanging on straps from the floor above and cannot support the weight of a large light fitting or fan. Rubber piping used for water distribution to cut labour costs and reduce weight on the ceiling.