It seems like supervisors personally don't care, but will get advised to crack down on things periodically. There are signs posted all over, but their attitude seems to change on it every 3 months or so.
Riverdale is right, big office buildings or malls wiith units that are not addressed perfectly make "sequenced mail" useless.
I've found that on first wave routes, you are sitting around for 45 mins waiting for depot support to release PCIs or you can just put your sequenced mail up. Seems like a no brainer.
If you're in a depot which is ruthless with putting up sequenced, what do you do on an overtime sort? Seems unfair to get paid the full split and only spend 20 mins sorting.