I suppose so. I guess I feel like if it could be solved with a piece of paper, it is still relatively okay. But yes of course, will be hoping i'd have an even easier time then!
Well no. It looks like this: https://azitalaw.com/2016/06/extending-us-visitor-visa/ (Exactly like that I should say). It is stamped onto the "Visas" portion of the passport. I've maybe entered US over 50x in the years preceding the k1 process, and sure enough, I got a stamp each time I flew.