3) Rolemaster is first and foremost a game. It was never intended to even closely model reality. Any "realism" to be found in Rolemaster is purely coincidental (and pure serendipity for those who like realism).
I agree with everything you said except for this comment. Even the 1st edition of Rolemaster paraded its realism as being a buying point ("have you ever seen a wolf use a crossbow?". The argument that it's a game and shouldn't try to model reality is what Gary Gygax used to say the Sorcerer's Scroll articles when making up excuses for clear and evident flaws in the game system.
(Such flaws have been since accumulated into their own book - Murphy's Rules)
Of course, this is hardly of the same scale. I don't know anyone who has ever used the Wind Chill chart from GL, except to say "there is a brisk cold wind blowing". It may be an issue if you're on top of a mountain and short of blankets and rations tho'...
Also I think the GL chart is supposed to represent a modification to the "unwindy" temperature, rather than an absolute figure.
I have to agree... RM has got to be one of the most, if not the most, realistic RPG out there. That is actually what I like most about it!
Having said that, I think temp. charts and weather charts are to be used sparingly at best. Like many others, I just say," it's raining pretty heavily, and has been for the last several hours. There is a cold wind blowing from the west and it feels about 46 degrees..."
I have enough tables for the stuff I
need!
But to each their own...