This is a difficult question to answer as there are many customs and traditions that dictate how Japanese tea cups should be handled. One popular theory is that the handle ruins the aesthetic quality of the cup, so it is not customary for them to have one.
Another theory tell, most Japanese teacups do not have a handle because they are intended to be drunk instead of being used for tea. Tea cups with handles were originally designed for tourists who wanted to drink the tea from the cup instead of sipping it from its bowl. Today, many people in Japan still drink their tea this way, and teacups without handles are considered prestigious and luxurious.
Whatever the reason may be, whether you're a fan of traditional or simplified Japanese tea cups, it's important to know which version you prefer before purchasing one. Otherwise, you might end up being disappointed with your purchase!