Almost everything the West believes about matcha arrived through a café menu. That is not a criticism, it is just where the exposure happened, and it means a lot of assumptions came along with it that would puzzle anyone in Kyoto.
1. Matcha is what Japanese people drink every day
It is not, for most people. The everyday cup in Japan is sencha, or hojicha, or a bottle of green tea from a vending machine. Barley tea in summer.
Matcha is occasional. It shows up at a tea gathering, at certain restaurants, at a temple, or in a dessert. Plenty of people in Japan drink it a handful of times a year and think nothing of it. It is closer in role to a good bottle of wine than to a morning coffee.
2. The matcha latte is Japanese
It is a Western café format. Whisked matcha in a bowl with hot water is the Japanese preparation, and milk is not part of it.
None of which makes the latte illegitimate. It is a genuinely good drink and it is how most people meet matcha now. It is worth knowing that when you order one in Kyoto, you are usually ordering something that was imported back
3. Matcha is originally Japanese
The method came from China. Powdered tea whisked in a bowl was the Song dynasty practice, and it travelled to Japan with Buddhist monks around the twelfth century.
Then China moved on. Loose leaf steeping took over there, and the whisked-powder method largely disappeared from Chinese practice. Japan kept it, refined it for eight hundred years, and built an entire aesthetic tradition around it. So matcha is Japanese the way pasta is Italian: not where it started, but unarguably where it became itself.
4. The tea ceremony is about the tea
The tea is the occasion, not the subject. A formal gathering is built around the guest: the scroll chosen for that day, the flowers, the season, the food, the specific bowl selected for the specific person. The tea is the thing all of that is arranged around.
Which is why "ceremonial grade" as a shelf label is a slightly funny idea. In Japan the ceremony is a set of relationships and attentions. It is not a quality tier you can buy.
5. Ceremonial matcha means one preparation
There are two, and they are not much alike.
Usucha, thin tea, is the one everyone knows: a small amount of powder whisked briskly with water into something light and frothy. It is what gets served most often and what most Western drinkers have had.
Koicha, thick tea, uses several times the powder in less water and is worked slowly into a glossy paste rather than whisked into foam. It is the centrepiece of a formal gathering, and traditionally the bowl is shared. It demands the best leaf available, because at that concentration nothing is hidden.
6. You drink it straight away, like an espresso
A sweet comes first. Wagashi are served before the tea, particularly before koicha, so the sweetness is already on the palate when the tea arrives.
This is not a garnish or a pairing in the Western sense. Strong matcha against a plain palate is a harsh experience, and the sweet is there to make the tea taste the way it is supposed to. If you have had good matcha and found it punishing, the missing piece may not have been the tea.
7. Matcha and green tea are the same thing
Same plant. Very different treatment, and in Japan they are not interchangeable words.
Matcha comes from tencha: leaf shaded for weeks, steamed, dried, de-stemmed, stone-milled, and consumed whole. Sencha is unshaded leaf, rolled and steeped, and the leaves are discarded. Gyokuro sits in between, shaded like tencha but steeped like sencha, and it is the one most Western drinkers have never tried at all.
If you like matcha for its savoury depth, gyokuro is the obvious next thing to drink. Almost nobody tells you that.
You don't need to learn any of this to enjoy a bowl of matcha. But if the café latte was the door in, there's a whole house behind it: koicha, gyokuro, a sweet eaten before the tea instead of alongside it. Most people never get past the doorway.