@Mike C I recognize that my original post is not the conventional wisdom at this moment, by any means, but I am glad that it sparked some discussion in this thread. One thing that came to my mind in response to your suggestion that 99% of good players putt with one disc; these players also recognize the importance of putting, but they have also achieved a level of mastery that is not easily attainable. Consider that the good players have shorter putts to deal with (due to their driving prowess) and thus more room for error with respect to judging the wind/making needed adjustments. The average player on the other hand asks more out of their putters than, say, a professional. Therefore, it stands to reason that they would need more putters. Maybe I am over-analyzing, but I was attempting to encourage discussion as well as challenge the conventional wisdom that, I believe, exists among most disc golfers that "the one" putter is the way to go, when in fact it may not be...
You could also make the argument that having a unique disc for every shot as a beginner would then stunt your growth and increase your learning time. The ability to shape different shots and lines with the same disc is a valuable skill, and it's more difficult to learn that if you have the crutch of a specific disc for every scenario. Again, it all depends on your approach to shot making and bag building.