In a literal sense, you’re completely right. Grow recipes make sense when you control every environmental variable, and that has not historically been possible.
On the other hand, there is useful data if you look in the right place: Wikipedia. Look up where your crop evolved and determine typical climate (temp, wind hardiness, natural crop cycle, etc) and soil conditions (pH, strength of nutrition, soil drainage, etc). For crops grown worldwide, pay close attention to where most of their production is, because that’s where they grow best. Find out whether is long-day or short-day to inform light cycle.
If you want to do library legwork, there are compendiums of horticultural advice. (For example, I reference Success with Herbs a lot.) They will give advice that’s either general or not directly applicable to hydroponics – like how much bone meal to put in your soil soil mix. The good news is they will note any critical deviation from standard growing conditions. They might also note useful cultural best practices like how to prune a certain plant. And if you really really want to do your homework, bone meal is used as a phosphorous supplement. If you read a suggestion for lots of bone meal, use a nutrient solution that has a higher P value.
This information will not be precise, computer-ready data, but it’s a place to start.