Animus said
Some roleplays in Casual have 'lower' standards where most CS's are Mary Sues, incorrect grammar and punctuation and some posts so short that they're almost impossible to squeeze the word quality in.
Some 'High Casual' roleplays are more detailed with better use of english than some roleplays in advanced.
This is the one I'm talking about. If it's possible for 'high-casual' to be 'better' than advanced, it seems reasonable to assume 'low-casual' can be 'better' than 'high-casual.'
Also all of casual and even advanced have games with sues and/or bad writing. However this doesn't matter because quality-based segmentation would be far too up to interpretation.
The clear, written difference between casual and advanced is that casual has 1 paragraph minimum and advanced has 2 (oh and use f7 slightly better.) However those are the floor, not the roof. So yes, if you want to fit a roleplay into a category, you just go by minimum post length (and use of f7.) 'High-casual' on the other hand? There's not even a standard for length there. Some just adhere to casual standards, others to advanced. The step is that small.
So if all RP's technically do fit in the labels, and quality isn't consistent or a ruleset, where does 'high-casual' come in?
Look. You want 'advanced games' with a bigger, more chatty audience. Which is a perfectly fine reason to post your game in casual. However it doesn't make the term 'high-casual' anymore meaningful.