Because not all drops are created equal. So if someone with a larger/smaller dropper tries to replicate that recipe ... the finish product could very well taste much different and not what the recipe maker intended.
Some people might think "yeah but if you use the same size dropper for the entire recipe the flavors should balance out and taste just like the original." Unfortunately that is not always the case.
Some flavors will taste completely different at a higher volume, regardless if you increase the volume of the other flavors in the mix. Coffee flavors for instance can be VERY sensitive to slight imperfections in volume.
Now having said that ... people are free to make and post recipes however they desire. I'm just stating the potential errors this can cause when others try to replicate a recipe using "loose" measurements.
All drops are not created equal.
This is true. And I don't think there is much to Debate about it. But once again, What is Difference?
Perhaps if everyone liked the same Strength of Flavoring it would. But people Different. Some Like 7% Flavorings. Some 15%. And to others, 10% is Just Right.
Just because a Recipes Proportions work for one person Doesn’t mean that it will be what Another Likes and or Wants. So being able to Exchange Recipes isn't that relevant to me.
As for Drops being a "Loose" measurement, I think you are confusing Accuracy with Precision. Check out the graphic below for and Example of the Difference Between the Two Concepts.
