I think the main reason this idea is being ragged on is because you are proposing to completely change the NATURE of the game.
The other changes implemented by CC (I believe) add-to the original Risk board game. Some of the options... like the card values and way you fortify where options in the board game too.
I can't speak for the original creator of Risk... (maybe I can... it could've been me who created it 30 years ago for all you forum trolls know)... but I think that the reason the dice work they way they work is;
1) the attacked uses 3-vs-2 because in "real-world" combat generally the attackers would have more armies attacking a "weaker" defender.
2) defenders win in a tie because in the "real-world" defenders are in fortified positions and so would have a slight advantage in that regards.
Of course the original reasons for the dice-play is moot... they work that way in CC because they work that way in Risk. The fact that Risk is so popular is enough evidence one needs to know one shouldn't mess with the fundamental nature of the game.
FOW changes of the nature of the game too (as do other options like teams)... but they ADD-TO the rules. They don't change rules.
