Blue boxes

I have finished all of the main Schweser material and Practice Exam Book 1.

I haven’t looked at the CFAI material at all but I keep seeing people here saying the Blue Boxes are important.

Should I spend this week going through all the blue boxes?

Are there readings in particular where this is more worthwhile?

I dont think blue boxes are importand and I think the are time consuming like that pencil example

But then why are there so comments saying they are vital?

no idea. I passed level 1 and 2 without reading any blue box