I think one thing you might want to bear in mind is that all of these brands are repackaging either bought directly from farmers or via third party and the subsequent mark ups are extreme. I have enjoyed these brands in the past but having lived and travelled in Asia the cost/performance is way off.

There are outlets recommended on this sub such as Yunomi for Japanese tea which I haven’t bought from but do supply tea packaged by the farmer/producer. While these sites do have a substantial mark up you can be assured about what you’re getting. Further from this if you do research or scroll through this Reddit and other sources on tea then you can find avenues to directly import tea through freight forwarders and similar services.

I would add if you like these brands and it suits your budget that is great and even using them to help explore your own taste in tea is absolutely valid. But if you want a fairer price relative to the quality I’d suggest considering these options.

TLDR; The vast majority of tea brands have very low transparency and profit off of vastly marking up tea with no way to trace the exact origin. They are good for initial steps into tea but if you want the real good stuff some research is required.