There may be a case for slightly randomising the appearance of bosses and elites beyond the standard time plus say, +0 to 30 minutes but it is hardly much of an issue since the Original Poster seems to be referring to one mob in particular, Rat Queen (and possibly Bumblebuzz Queen, Dark Shaman and Royal Spider) that are the only mobs capable of being killed by one player alone easily.
All the other mobs are much tougher and with forthcoming patches much more difficult to kill.
Clearly the Original Poster has not had the opportunity to encounter BeastBane, The Master, Edward or Destrucktor all of which ideally take a team of 4-8 players (not always from the same guild at all) far longer than a minute - think 10 - 40 minutes !
A lot of the Original Poster's suggestions seem to be to make his game play easier and belies the fact that he seems unwilling to play the game as it is now.
I dare say if the OP took up Chess, he would be suggesting that the moves of the Knight were irrational and the rule for Castling should be changed to make it easier for him.
I'm glad you used chess as your example, it's actually perfect. See in chess, every player starts with the same potential, the same opportunity, its based on your skill and wit within the 1 game you're playing, after that game is over, the board resets and the same even opportunity is given. When you say the way things are is fine its like saying; lets play chess, but instead of pawns i get extra queens, knights, bishops, and castles. Lol, you're proving my point for me.
Kira you're part of one of the big 2 guilds on the server so as Nomaso said above, of course you're against this. a 30 min window of change doesn't fix this problem it needs to be random between 5 min-12 hours at least.
I have encountered other bosses and elites and i identify that they take more than 1 person. But guess what they have timers too, so once one of the big guilds locks down the timer they can hold it indefinitely.
Everyone has told me that RNG is a good system and told me i was an idiot for suggesting anything else. If it's true that RNG is so great, than why isn't the same random chance principle applied to boss timers?
This change takes away power from some of the larger guilds and higher level players and equalizes the opportunity to other guilds, solo players who party up with friends, or just the random guy who think it'd be fun to kill a boss in a game, or at least attempt it.