100% reproducible results for both is definitely "science".
The processes that happen to make the flavors and textures and results you're looking for - absolutely "science".
Some very finicky food types require a lot more precision than others, so some (very small percentage of) recipes you absolutely do have to follow very strict recipes and procedures.
But the majority of stuff - baking or "cooking" - you can wing a lot and get great results. You just might not get exactly the results you thought you'd get.
In my experience in a house that doesn't have strict climate control (no humidity control, windows often open, inexact temperature control), intuition on yeast-based dough is actually really important. Two days in a row the same exact simple bread dough recipe can behave very differently due to factors like ambient temperature and humidity.
The trick is getting from a recipe cook to an intuitive cook. For me, I feel like that leap came primarily from a single book (and years of prior absorbed "Good Eats" knowledge):
https://www.goodreads.com/book/show/3931154-ratio Ratio: The Simple Codes Behind the Craft of Everyday Cooking by Michael Ruhlman
Highly recommended read.
1. The chemical reaction to make it raise. As I said, yeast is different; but if you're using soda, you need the right amount of all the ingredients (soda, acid, salt, etc), at the right time (water starts the reaction, which will fizzle out after a certain amount of time), at the right consistency (over-mixing will screw things up too).
2. You need to balance wet and dry ingredients. So you can't (for instance) just remove sugar or add flour without also removing or adding something "wet", or the balance gets thrown of and everything changes.
For yeast-based bread you're right -- I normally just dump in water until it seems about the right consistency.
Small changes in how you handle doughs of different hydration, and changes in timing/temperature thereafter have a much bigger difference to the outcome. I think it's better to develop an intuition for what the right consistency is and work towards that.