While I understand that the manager will automatically clear the infected status, that does not work well for those systems that get decommissioned soon after they report an infected status.
Our environement is large enough that we cannot keep track of workstation attrition and we are required to keep systems in our database for 30 days, unless we know they have gone away.
So please bring back the "Clear Infected Status" button!
I think the manual option must stay, if you don't trust the AV admins (which taking away this option seems to imply) then they shouldn't have SEPM access.