In your opinion is it better for a game to have more or less supplements? While having more supplements gives greater flexibility in creating characters it greatly increases the chance of unbalancing a game system. I think it is an advantage to 5e to have less than 3.5 The more variables you introduce the more likely the game will end up being broken. The more materials the greater the difficulty in keeping it balanced. I was on another website the other day looking at some Play By Post games. This Dungeon Master for one 3.5 game had over 100 houserules to keep it from being broken. 5e is well balanced now. Sooner or later if they produce enough materials they will slip up and power gamers will flock to the option.
Anything can be broken by a house rule or from people not fully understanding things. Yes more supplements can make something hard to keep under control. I am one that if the game proves to over power something there is always a way to counter that over power. Sometimes it is simple to just not allow it.
There are advantages and disadvantages to both, and have found that it highly depends on the group.
If the Dungeon Master is good at countering power problems, and the players both aren't liable to push for power problems too hard and want a highly diverse mix of character options, then for the most part the more supplements the better
If on the other hand for whatever reason there are likely to be balance issues that won't be easily controlled, and/or the players don't want to hunt through material, then by all means limit the spread.