You are absolutely right. You can't have both. It's either quality or quantity. If you are looking for quality, a lot of people will not make the cut and Steem will not take off. 
As it is, Steemit is a platform open to all, and it's up to each individual to decide what they want to do here. 
If you want quality, steer clear of the trash. Just remember that without the trash, you might not be as successful as you wished.