I am new to tasting, so I am adjusting my ratings of each tea to accommodate my new experiences and learning.
But overall this is my logic:
95+ are teas I want to have on hand and buy again. I am willing to save my money for them (within reason) and measure out every last 10th of a gram.
90-94 are teas that I highly praise and recommend, but they are not ones that I prioritize to buy again and have on hand.
80-89 are teas that I am thankful for trying, but I would rather save my money if necessary to buy a 95+ tea.
If I do not rate a tea, it means I feel bad about giving a score of 79 or less and would prefer the community and experts weigh in with their math.