> the different window managers can choose to implement it just one way. They don't have to do it N different ways,

Not holding my breath. Just because you have a standard doesn't mean all implementations behave the same. In fact, they usually don't, which is the problem.

> but what you are saying isn't really a problem

Thank you for proving my point about being in a position where you don't have to suffer the consequences of your bad architectural decisions.