Why did they limit to that level? I would like to try this, but I assume the FCC had a good reason to limit it

EDIT: found this page https://infishark.com/blogs/learn/wifi-transmit-power-limits-by-region that says the US has the highest limits already

The longer the crash takes to happen, the more malinvestment that is occurring, the more painful the recovery to be. If you want this to be as painless as possible, you want the crash to happen immediately.