I'm probably not explaining myself very well, so I will try and by more detailed.
In D&D, role-play starts at Level 1 with 0 XP. All XP, all progression in D&D—and I'm talking about PnP-type D&D game—is Role-play based.
On BGTSCC, progression is not RP based, it is mechanics based. Thus, half experience the "difficulty" of the Server because they are not skilled in the game mechanics, and half find it "boring" because they have exceeded the level of knowledge it takes to easily progress through the game/server.
I could, and have, only played a PC to level 13. But what kind of game is that really, when there is no game after reaching any X level? What i mean by this is a game based on role-play and storyline(s), and not just that you inhabit a Character for X hours per day/week/month and just emote chat. I'm talking about the active game where there is a beginning and an end, essentially, a campaign.
Now, what I'm not saying is that it is impossible to have a best RP experience on BG. Because I've had it myself, multiple times. But it take so much damn work to create it. It requires a boat load of OOC effort, willing partners in other players, and a consistency and attention to whatever "flow" the players/group chooses (like, for example, not progressing outside of scheduled play times IN that group).
So what I mean about the Server not supporting "RP should not begin or end at 30" is that the concern of players is more progression to experience game play, versus role-play that flows with a storyline or interaction that is full and rich REGARDLESS of any need for progression.
On offer: I will STFU when I see a Level 1 campaign, as rich and full as Level 30 server/DM event campaigns, where the goal is achieving an role-play experience, and not just XP experience and mechanics-based action/progression.