No.
In the early 80's, I must have asked what the green vegetable was in my plate at a favorite restaurant. I'd finally learned what cilantro is. Off I went to a supermarket in a somewhat ethnically-diverse neighborhood. I don't remember the cilantro; maybe I saved that for my 2nd shopping, at an Asian market. (I don't know if there was a Mexican market, anywhere around during those days.

)
The big, white-stemmed bok choy I found at the supermarket was not to my liking - too coarse.
The Asian market had bok choy,
all of it small and green-stemmed. I began to grow that in my garden. (Cilantro, I still have trouble with altho I have it early and late in the garden. Buy it quite often.)
I have grown Toy Choy and it is white-stemmed and just fine ... except that it is really tiny!
I have grown several green-stemmed over the years, Black Summer was fine. Those just labeled Ching Chang are real variable. I always return to Mei Qing choy.
I'm not a cut-and-come-again bok choy harvester. If you do that, Mary, my advice is to harvest early and often. You remember that I don't like the heavy stems of most chard varieties

. It's true sorta with bok choy. The stem is heavy but I'm not happy if it is also coarse.
tender stevie