Also regarding wood, this isn't the kind of wood you're thinking of. It's called pressure treated lumber, and it's an order of magnitude stronger than normal wood. The lumber has preservatives injected specifically to prevent rot, insect damage, and fire resistance.
However, the wood material usually used to build these mid-rise buildings is cross laminated timber, which does add significant strength to the wood materials. Really cool material actually!
Aside from outside uses (decks, patios, landscaping etc.), pressure treated lumber of one sort or another might be used for a few select applications for home construction, such as sill plates or a bathroom subfloor. Nearly all of the wood used for regular homes is non-pressure treated, at least everywhere I have seen in the US.
PT wood is roughly 4x the cost and substantially heavier, framing a whole house in it would be nuts.
It's different from glue-lams or engineered joists, which are just regular old wood that's been glued together.
Warmer, maybe, but bad for people and good for fungi. Many contemporary buildings are built too airtight, lacking natural ventilation, which causes huge problems with interior air quality and traps moisture inside structures, creating places for mold to thrive.