This. I moved from being the Main Tech Guy at a startup to being a backend engineer at a mature company running Scrum. I was amazed by how little work anyone did at the mature company. People obviously doing f-all during the day. If we finished our sprint 3 days early then we just pretended to be working (what is the point in having a standup every day when there are no tickets to work on?).
It was painful. I constantly felt that I should be working, because I was being paid decent money. But there was nothing to do, and no-one wanted me to do anything. I couldn't focus on a side project because I felt so guilty about taking their money and not doing anything.
We adopted Mob Programming. Five senior engineers on one call writing one piece of code. Or rather, one of us teaching the manager some Golang while he spent 4 hours doing a ticket that should have taken 1 hour. No stakeholders present because none of them wanted to waste a day watching us work.
Such a waste of time and talent.