because it is tough to get consistency within the package, it may be weighed out and mixed perfect at the factory but over time the elements of heavier weight will settle to the bottom thus fucking up your ratios, liquid the same happens but you can just give it a quick shake.
I remember there was a lawn seed company that had this problem licked , they would bond glue the elements to the seeds in different sections like a rocket Popsicle.
This would involve a big cost so it would be tough for a non monsanto company to do. That being said there are lots of granulated and powdered recipes you can mix your self wit great results.
I guess you need to tell us why you want to change , if it is just cost I would consider what the value of your weed is to you and if you would want to chance the quality, and quantity to lower your costs. As a guy who has been doing this for 20 some odd years I would say to you
IN THE NAME OF JOHN A. MCDONALD AND FOR THE LOVE OF GOD, LEAVE WELL ENOUGH ALONE YOU STUPID, STUPID MAN, DO YOU EVER LEARN!!!!!!!! but that is more me giving myself advice.....that I never listen to.