edit for typos only)
Very interesting discussion here.
If I may toss out my thoughts as a VERY new player, who is still in the process of finding and completing a few random quests myself... I will agree there is a strange and very uncertain grey line that bothered me recently, in trying to define WHERE the game of MD stops and the creative flights of fancy start.
To use the example of characters, I see the story mode and picture 'myself' as a human similar to the guy behind the keyboard here... Add to that a few vague OLD comments from MUR about how MD was developed less as a "purely sandbox role-playing game" and more as a reflection of Life in a fantasy world of his design.
Then again, I have been directly welcomed to create and grow the "character" of maebius in any way I see fit since magick happens here. If I wanted to re-write my papers to be a dragon with angel wings and able to breathe glitter-breath, that apparently would be accepted by quite a few folks, veterans and newbies alike.
Yet, in my mind, the two "realities" are at odds, which causes Rumi's initial concern. On one hand Pure Fluff-Roleplay (not to describe it insultingly) allows so much open-endedness that it can not by definition be limited my game mechanics. One the other hand, sticking to pure game mechanics as I see then so far (am still new, just hit MP4 a day or three ago) the only think I feel allowed to do is click on things to enter pass-codes, and fight with my creatures against others, while changing the "background" of the scene using little arrows.
In order to bridge the gap between the pure PURE mechanics of clicking things in my browser, and seeing the world of MD as a realistic environment, you need to mix in the Adventure Log, and old Forum Stories and stuff along with the StoryMode descriptions and the papers of individual characters playing along with me.
Unfortunately, this means using those Old stories of Lore as a foundation, and a very strong feeling that simply saying "Maebius builds a fence around Bob to protect him" would be dismissed as fluffy RP in the best case, and "Don't mess with BOB, you noob!" in the worst case, since Bob the tree is an established lore/game feature.
It's a very, very fine line that seems to be drawn differently by different people.
I agree with Awiiya's comments in that such "mandated Authority Reality" on Mur's part is not necessary either, since to do so would automatically limit the creativity, as well as change what I am slowly sensing as an underlying Reality of MD itself, which I can't describe any way except "a social experiment to see how we act and reflect on those actions beyond MD". (this of course trivializes the game MUCH more than I intend with those words, as they convey the idea too simply)
I would personally lean more towards the former suggestion of allowing greater creativity, similar to Burns's encouragement of greater creative ideas, yet also understand that in order to be "Appropriate to MD" as a newer player sees the world, all we have to go on is the Old Lore. Pure Roleplay is jsut chaos and against the apparent designs of a structured world.
As time goes on, I am realizing that there is danger in both ideas though, as if MD starts to lean towards a purely Roleplayed environment, that is just as limiting as enforcing a particular adherence to certain rules. I am wondering if the "Game Mechanics" of MD are just being totally misinterpreted by a lot of people, myself included, and actually include the Roleplay, in some limited and veiled manner.