The way I imagine it is the same when you eat your favorite food every day. When you eat the same food every day your taste bud start to look for something else. Maybe that's how creativity works as you mention about boredom.
I really enjoy your content this week about not knowing what to write 'cause it's relatable—even though my current streak is only around 40 only compare to yours.
Plus, I will put this discovery in my notes so that I could get back to it soon if I ever experience again the moment when the well gets dried up.
P.S. Interesting that my initial short comments start to become too long so I just decided to expand it and make it my #200WaD. It feels like I cheat after I just finished my long post today. Since I write 90 minutes before my streak lose. I just continue writing after I read your post.