MarioFanaticXV
There is a reason why the current ban system works better than blind pick, because there are characters in the current meta who are clearly superior to all others.
Lets say you have 7 options, option 1 is clearly superior whilst options 2-7 are about the same level, in any competitive environment, without question, you will always pick option 1, because you want to win, in this case, despite having the appearance of 7 options, you only really have 1 if you want to succeed.
Take away option one for both teams however, and suddenly your options are expanded, there is no clear winner between options 2-7 so although you've lost an option, you now have 6 viable options for victory.