Optionally you could get rid of the Starter/CP division. It is an arbitrary differentiation that does not help diversity.
Trust me, I know that full stagelist striking "FLoSSing" is the better route. I also know people already are going to argue like mad over most of the stages. This isn't a what is actually better question, it's convincing folks to get rid of something they've done for years and refuse to take any evidence to the contrary is wrong or broken. No one I have discussed this with in the general populace accepts giving up starter/counterpick systems and it is to a point were I would hurt tournament attendance to just make stages legal or banned.
I know it sucks, but it's going to take a huge community shift before I can consider running this in a community that I have to beg and fight with to even allow a single stage with a hazard to be legal. How can I even remotely tackle this?
If you could write up an argument that could convince tons of TOs and users to adopt this I can try to put it up and see what people think, but I'm not optomistic.
In the end though the largest tournaments will decide the ruleset, and they have the oldest TOs who aren't going to change. IT sucks, but Alex Strife and the Apex team have way more sway then we ever could imagine. Even if you got every other event person using only legal/banned stagelists, all it takes is for that ONE event to not do this and it doesn't matter. The best it seems I can do at the moment is at least try to keep as many stages legal as possible to prove they don't have issues, and even that will probably mean squat anyways, since when in the history of smash have large TOs ever listened to sound reasoning to keep stages legal? Anyone who discussed stages in Brawl should feel that one painfully well.
It would take a giant community shift, maybe even an entirely new major circuit to get people to even consider this as a standard. I'd even run one if there were enough TOs, it would be nice to have what is actually right be used for once. But how am I supposed to sway this many folks when all I am is a TO on the web, change years of their thinking?