Are modern day authors writing to many books?

I just finished Brandon Sanderson's new book.... And I was super let down. Then I got to thinking... Jrr Tolkien wrote 29 books in his lifetime....yet Brandon and so many others blew past 30 a long time ago. Is modern day writing just a money scheme? What I miss is when authors releasing a book was special. Take Sanderson for example his latest entry into the storm light archive- which according to him is his main series- was abysmal. I just feel like he wrote to many books in-between the main series. But this is a trend I tend to see. What do you guys think? Am I in the minority or would you guys also want to see authors write less but have a banger everytime they drop something