I think there's room for both a welcome committee and a learner's tag. A lot of the RPs I'm in, it feels like people expect the DM to say "figure things out or pack your bags." In tabletop games (and likely arena too), it takes a little while to learn the ropes. Heck, any game that has combat, whether through dice or storytelling, has a bit of a learning curve. I know I'd be more likely to join an NRP if I expected the DM to help teach the basics along the way, as it's a genre I've never touched. I'm sure plenty if people think similarly about various types of RPs.