It's probably my lack of experience, but I find tea harder to make correctly. Depending on the tea, should I rinse the leaves ahead of time? How long do I let it steep? How hot should the water be? How much tea should I even use?
For coffee, I pour hot water over my ground coffee until the pot underneath is full of coffee.
That is a very oversimplified way to describe making coffee - and thats just for one method of brewing.
You have so many variations of brewing like pourover, drip, french press, espresso etc. and each of these methods has a ton of individual variables that affect the final product ranging such as water temp, bean freshness, grind coarseness and much more.
I am certainly not a coffee expert (I'm too lazy to actually dive into the world of craft coffee I just drink the free coffee at work) but I do enjoy espresso when I am out and love reading about coffee/brewing
There are two things econcon could've meant by "create" - either what happens before the tea/coffee reaches your shop, or what happens afterwards. I'll go with your interpretation...
I'm a fan of tea, ignorant about coffee.
Tea brewing generally has three variables: amount/proportion of leaves/water, water temperature, brewing time. With coffee, those three are still applicable. And there's a fourth variable: how finely one grinds it, and perhaps a fifth one: whether/what pressure to apply while brewing.
I usually don't even rinse oolongs/greens and it's fine. If you don't rinse your puerh, the first brew is just going to taste like a rinse. No big deal - enjoy the subsequent brews :)
For coffee, I pour hot water over my ground coffee until the pot underneath is full of coffee.