For
They allow more people to live in limited land areas.
Against
High-rises can be expensive and ruin city skylines.
Anonymous excerpts, translated where noted.
“Most of the solution to the housing crisis comes from higher density sites”
“Tall buildings use more material per unit area and require a bit more operational energy... they also massively cut down on transport costs”
“Tall buildings don't really solve the density problem.”
“For residential buildings, apartments and such 4 floors is supposed to be somewhere near the ideal density I believe”