You assume anything any big corporation does is the optimal way of doing things?

No, I'm saying that 'big corporations' universally do not have easy, low-hanging fruit sitting in front of them that would instantly improve productivity.

If 'remote work' were some really expensive investment, then we could see that it would take some to make it's way into big corps.

But it's relatively easy, and trivial to experiment with, and most companies don't do it in most cases.

What worked 10 years ago before their IPOs might not work now. Plenty of talented people won't even consider non-remote work these days and those are often the most driven ones that don't want to be stuck in offices/traffic all day long but have some life as well.

Not that much has changed in 10 years and FAANGs had their IPOs 20 years ago.