It just seemed easier to have a liquid to dose. I guess I will have to go out and buy the table spoons because I do not have a 1/16 tsp!
You can go either way here, some find it easier, I do not like messy liquids dribbling everywhere, I can make a nice little rack on my tank for this etc, some use liquid dosers etc, there are certainly ways around that, then you can do this daily dose type of thing if that is an easier habit for you.
Some catch different things with a method that make sense to them, while others hone in on another aspect. We all learn differently.
PMDD +PO4 is the daily version. Most had issues and scared of ppm's and mls and gram scales etc, so teaspoons proved fairly easy and common device that did not scare folks.
Adding it dry instead of daily in liquids made things easier for some, but some have better habits dosing daily when they feed their fish daily. Others if they remember , 2-3x a week etc.
More a human issue than a plant/method dosing issue.
So whatever works and gets the job done.
I'd strongly focus on CO2, using the right amount of lighting etc.
After doing the ferts a couple of times, you'll realize they are pretty easy to deal with. CO2 and light will give you a lot more to work with and issues to modify to get better results/management later.