I'm not sure there are any solutions other than customized and active management. Have lead two teams over the last 3 years. I'm not a manager, a mere scrum lead, that entails more of a frontline people/technical leadership position in my org as opposed to process evangelist. Both teams Ive had the exact same approach with at least in the beginning; people over process, autonomy over oversight, explicit expectation of no more that 80% commitment, flex time etc etc a healthy approach as far as I was concerned. The first was brilliant sucess to the point that the team was naturally agile, scrum was a joke of a projects, and I actually started cancelling dayil stand-ups because they were a pointless meeting. Over half the team turned into overachievers, we actually had to start forcing people to take time off to guard against burnout.And not PTO mind you, unaccounted flex time as a courtesy for good performance.

The second went completely off the rails. Near total underperformace, maybe on average 20% utility, people trying to game the system and cheat the team, esp with flex time and PTO. Why I have no clue because we never changed our policies, "I don't want to work today" has been a valid excuse our org. The larger org is so cooperative, that you could check out in the middle of release if you wanted to, no questions asked and people would cover for you, because there has always been an underlying trust that you do you best when you can and you would do the same for your mates when the time came. This was so widely abused that I have to take 2 sets attendance, one publicly and one on the side (the latter is where I count how many times grandma died), I'm having to chase people for deliverables, stand-ups are daily and an interrogation session when I have to publicly shame people for trying to cheat their teammates. One guy actually posted his second job on his linkedin(he was axed). And now I have to wave the big hammer of looming layoffs around. Overall a pretty miserable situation. Finally after many draconian measures there is a glimmer of acceptable performance.