A simple notice requireing CSM/CSD to allocate cabin positions at check in according to need/experience
Why should that be required? Allocation is what the JPM says, it's just that CDSs decide not to do it that way as they're often too scared to upset the crew. The book is written in this instance so that the CSD should use their management skills to ensure that the positions allocated give the highest levels of safety and customer service. The "in charge" crew member decides that it's just easier to let the crew pick. This is a failure of leadership - plain and simple.
The link to the current dispute is tenuous but it does show that the older, more experienced crew feel that it doesn't matter what the regulations say (JPMs) or management (in this case their immediate supervisor), they are untouchable and will do it there way. This is why we are where we are.