> it's not about missing amenities, it's about pressure from your peers and additional eyes in the office to make you work.

I agree. Though, you seem to have missed the part of my statement where I said "[It is a not-infrequent sight to find] folks sleeping, reading, or otherwise slacking off atop [the company-provided couches and comfortable chairs in the office].".

Add to that the fact that it's bloody hard for a casual onlooker to distinguish "doing real research on the Internet" from "fucking off on one's computer", and also the fact that heading out for a long lunch or coffee/smoke break to "talk strategy" [0] with a coworker is a common activity in the office, and you end up with a lot of tacitly-company-sanctioned fucking off on company time. Like, a staggering amount.

Perhaps the companies you've worked for have all been merciless results-focused taskmasters and the situations I'm describing are entirely alien to you. If that's the case, then -for you and your coworkers- absolutely nothing relevant would change in an all-WFH environment.

[0] Read as "shoot the shit where noone can overhear"