Well, I'm glad that you found the measuring method, that in your opinion and experience, is the best for you. It's one of the nice things about DIY, IMO. We can all choose which method we like, that enables us to make perfectly great DIY.
IMO, there IS no 1 method that is, as many people say, "the easiest, most accurate, the best," etc. for everyone who does DIY. (In fact, many who've seen my posts for several years now, know that's sort of a "hotbutton" statement to me.) Mixing by volume is already no fuss, no muss, no mess, and very fast, for me...the way I do it. If it wasn't, I'd likely consider switching methods, especially since I already have 2 scales used years ago for other purposes, that could be used for it. But, I doubt I'll ever need/use them for DIY.
Opinions vary. Everything I said is true for my uses. It is way faster with less to deal with, clean up after. So I can agree to disagree with you. I'll do it my way, you do it your way. I will however also agree that the word 'best' is entirely a personal thing, why I didn't/don't use that word.