I remember listing an RP as 'low-advanced' but it was purely to poke fun at 'high-casual.' I had no idea it became a thing. This is hilarious.
But yeah no, 'high-casual' is mostly an ego-thing. Which is pathetic because hey you can write two paragraphs congratulations, here's your 'no-really-i-srsly-am-a-big-deal' shirt/hat/cake. I feel categorising categories is bullshit, but hey I think a lot. Mostly that I ran casual RP's that could have easily been ran in advanced due to site standards, but I purposely ran them in casual anyway due to the crowd and mindset I wanted to attract. I would not have had and don't have any issue with single paragraph posts, because it's casual, but the majority of players whips up posts that could easily go in advanced. I wouldn't dream of calling it high-casual, because the game is open to everyone who can write 'casual' posts. What kind of posts get in there depends on the people that post.
The funny thing is, when I create an RP for advanced, I specifically tailor that RP for a different crowd and style of RP'ing.
The moment you get to understand what the sections really mean, which are a minimum and a certain set of preferences for games, topics and posts like these are just silly.