I have had all of these in Japan 30 years ago. I do not find green tea or red bean paste ice cream to be “Delicious”. In fact I had to control my gag reflex the first time I had them since I was with Japanese business partners.
Matcha is an strange bitter flavor that tastes awful in ice cream, they throw tons of sugar in it to disguise this.
Red bean paste is sweet and cloying in an annoying vegetable kind of way that also is not good in ice cream.
If you were raised on these flavors then maybe I could understand.
But I’m sorry, but I just detest them. Again, awful. They taste yuckie.
