We have this discussion every year with various roboteer's who turn up without locking bar's, or don't use them when arming up and we simply do not allow it now. There was 1 exception at the champs where they couldn't use it die to bad design and so that robot was armed up when everyone was out the arena and with extra precautions. We won't allow that for the same team next year. For me as an arena marshal, it's just too unsafe any other way.
Where possible locking bars are re-fitted before they're deactivated aswell.

It's in the rules and needs to be designed I to the machine properly.