A little bit of knowledge can be dangerous.
When I started drinking tea in 1998, I purchased my first green from RoT (Republic of Tea who happens to be almost as "popular" here as that other retailer), came with very simple directions, like one sentence. Only problem is they were wrong, too general snd way too HOT
... whoa talk about bitter brew. I could have followed those directions for the entire tin and never had a decent cup. And maybe never tried another green again.
Fortunately, like so many of us, we discovered correct brewing through other resourses or on our own.
As I read the current Adagio labeling, I do not think I ever follow the brewing directions for greens, possibly yes for the blacks. But they definitely need work.
In varying degrees, I am one of those who will use a scale, thermometer, timer, etc when I feel it is appropriate to the tea for me. Having clearly defined parameters in various measuring languages (grams and teaspoons for instance) would benefit many tea drinkers, especially those who are just not the "wing it" types ... a lot of this has to do with personality.