I will say -since I gave my mind some more time to think and read some more of everyone's posts- that game mechanics do prevent a lot from happening from the interaction part (besides /duel). However, I don't think that EVERY single low level character can get their butt handed to them since they didn't take the time, away from RP, to level their character. Yes, as someone has recently stated, that quite a few low levels try to god-mode their way in a fight and then feel angry that they were defeated in whatever means. Or they try to kill a character who may have more experience than them. Buuutt, permission is always key (Hopefully you all won't give someone permission to kill your toon unless you really know them XD), and also deciding whether or not the person you're RPing with is a good RPer, or just someone who'se on a power trip (This more applies to the whole RP duel aspect rather than the kill one).
Of course, people don't have to fight, but there are times when RPers are attacked by others due to a reason (mostly drunkedness if at a tavern). But, at the same time, it's somewhat... rude? (Not too sure if that's the right word for this case) to say that someone can't RP because they are of a lower level. Now, I'm not saying that anyone has stated this, but, from what I can somewhat gather from this thread, it makes it a lot less fun to be a lower level than to be at the top. And, while some people prefer to level and RP, some people just want to RP and don't care about levels. Should they be penalized due to the stigma of other low level god-moders? I guess that is up to the individual of the person Rping with a low level RPer, and the low level RPer themself.
For the simplistic version (Due to me typing a whole lotta stuff), game mechanics should matter up to a point in my opinion, and it can describe the experience and trials a character has gone through. But, at the same time, I don't think RP needs to rely on it every single moment due to the confusing nature of questing and raids (since a lot of Rpers have not actually done the raids and quests ICly, if one thinks about it). But, uh, again, it's all a matter of opinion. And also trust, 'cause that's important too.
And not every low level has that ego problem, stating from experience. Hell, Cheru is the king? of fighting failure, so it doesn't surprise me anymore that he doesn't win any of the fights he might get himself in to. (I WILL say that I think I did used to have the ego problem back on my two other main RP characters on their realms, due to them being kinda, uh, super awesome sauce? -not really. But, that is also because I think out RP before it happens, so I tended to disappoint myself when something didn't happen similar to what I had envisioned. I'm getting better, I swear).
*Breathes some more, and crawls back into a hole.*