[Misc] Do you layer multiple serums? Why or why not?

Beauty Tips For Body Care
I personally like to stick to one, then moving onto the next. Since my routine is ~9/10 steps, I already layer multiple products but they are different types (cleansers (oil/water), toner, essence, serum, moisturizer, eye cream, lip mask [nighttime routine, daytime sub eye cream and lip mask for sunscreen and lipbalm. I also do a sheet mask once a week and exfoliate 2-3x).TL;DR: I’d like to know if layering multiple essences would be more effective or if I should stick to what I’m doing, which is finishing one bottle before moving onto the next?
Girls Blog 2015
Submitted by IndieAnimal