There is definitely a point of oversaturation of fixing, but if you're clocking in around 40/360 or 50/450 then you're right on the money. You don't want anyone to every draft a really cool archetype but unable to play it due to a lack of fixing being available throughout the draft. Sure, if a particular drafter focuses on gobbling up premier fixing early (one of my friends did this and made creaturelands.dec which was dope), it will lead to complications across the rest of the table. But, you curtail this by having that many slots for fixing in the first place.
Pretty much if someone wants to draft a two color deck in my cube, they should be able to do so comfortably knowing that SOME kind of fixing will eventually head their way that they can make use of. Three color you need to pick the fixing a pick or two earlier, but that's reasonable if you're going to be more greedy. Just flipping the mana bases into being more restrictive and calling it a day is just not going to work in many of our environments. I firmly believe that good fixing leads to more interesting environments. I'd have to make sweeping changes across the board to accomodate the new lack of fixing, tinker with archetypes, figure out CC costs and curves throughout archetypes, etc. It's just more convenient for me to not have to worry about that aspect when designing the finer points of a cube.
Pretty much if someone wants to draft a two color deck in my cube, they should be able to do so comfortably knowing that SOME kind of fixing will eventually head their way that they can make use of. Three color you need to pick the fixing a pick or two earlier, but that's reasonable if you're going to be more greedy. Just flipping the mana bases into being more restrictive and calling it a day is just not going to work in many of our environments. I firmly believe that good fixing leads to more interesting environments. I'd have to make sweeping changes across the board to accomodate the new lack of fixing, tinker with archetypes, figure out CC costs and curves throughout archetypes, etc. It's just more convenient for me to not have to worry about that aspect when designing the finer points of a cube.