The most interesting rule change is the elimination of the catch-can man. He was also the guy that made most wedge and track bar adjustments. Now the right rear tire carrier will probably pick up that job. But somebody moving around like the tire crew might have problems handling the weight jacker tool too. The right rear of the car is the most dangerous place in pit lane.
It might not improve things as much as they think.
I personally hate that part of the changes. I think it isn’t necessary and could cause many more problems than it fixes.
You’re right about the rear carrier, although they are pretty used to changing rear track bar and/or wedge, but catch can guy also helped with that.
Probably why HMS rented CMS for a day to practice pit stops.