I don't want to bring mixing by weight into a discussion about drops.
Mixing by drops or ml or percentage is absolutely fine. Just do it the way you feel better.
My point is: If you want to share with others, give them ALL the information.
@Ld3441 just said, and I couldn't agree more, about info and what people do with it.
If I'm going to share a by drops recipe, I can tell how many drops/ml I'm using, and now everyone has the same information (the common ground for understanding)
I'm I'm going to share by absolute ml, I need to refer to the total ml, so that everyone knows what are we talking about.
Percentages just skip all this, and make it simple, imho.
Mixing by weight is a completely different subject.
It's more of a natural human behavior: Rejecting the new, stick with what we're used to do.
Everyone of us do it.
I already saw a post where
@RocketPuppy trashes one reason not to mix by weight. Bring'em all!!!