Does flashback/backstory ruin the pacing of Anime?

No. Isn't that sometimes essential for the storyline? We need to watch some things in the past to get better understanding of the story
 
i don't know lol
if it's just too boring, wouldn't that take out all the fun in watching anime?
 
Sometimes it does man.
Imagine watching a very interesting and thrilling fight or moment only to see the past story, without it getting completed.
 
I enjoy seeing the flashbacks presented in a story. They help to answer the why questions, and help to gain a better understanding of a character or situation.
 
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