Casual has always been a middle ground for people where they can have fun without worrying about putting too much effort into it. The problem is when the casuals become better and better but are too scared to move onto advanced as such their skills have advanced but hesitation keeps them back. This ultimately leads to the conundrum. Casual becoming advanced. And this ends up setting a presidence for a skill cap unwarranted for that section. 

It happens but I say don't let it bother you. If you feel the RP matches your interest and you are able to meet with the regulations and criteria set by the GM, go for it. If you feel uncomfortable, find another RP. 

Like they say, many fishes in the sea.