Coffee goes stale a lot faster than tea. So while freshly ground coffee would have no real problems being steeped in a bag it’s a really bad idea to package and ship preground coffee in a bunch of tiny little baggies. You would have to seal each bag in something airtight individually. Which is going to be more expensive than just buying a can of it, and lower quality than a bag of fresh beans. Without all of the convenience (real or perceived) of something like a kurig.
As for why tea is steeped in bags other than some other method? Well, you totally can use other methods and lots of people do. Tea bags are just super easy.
You can get coffee bags. And lose tea will brew perfectly fine in a French press. I have not actually tried brewing tea in a coffee machine but I suspect the leaves will make it hard for the water to soak through well. It is more traditional. Ground coffee needs to be kept away from air as it will go stale while tea can be kept in the open. So coffee bags can be hard to store like tea bags.
The reason why people go to the trouble to press coffee rather than steep it in a bag is that when water runs over coffee and extracts flavor, the first flavor it extracts is the flavor people like the most. The flavor that is extracted over time, such as by steeping the coffee or having the grounds exposed to water for a longer time, is more bitter and most people are turned off by it. That’s not the case with tea so it’s fine to soak tea leaves, they’re still yummy. But by pressing water over coffee (FYI: the root word of espresso is “press”), you are minimizing the length of time the coffee is wet and you’re getting out of that coffee the freshest, first, tastiest results of the water being pressed over it. This is a lot of trouble, and it’s not at all needed to get the good flavor out of tea leaves, so nobody bothers doing it for tea.
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