What i have on my fries depends on what I am eating
I like ranch dressing on my fries when I have Hot Wings
With Beef I just soak up the beef juices or gravy if it is available
At Mickey D’s I’ll get a side of barbeque or sweet and sour sauce for my fries. Of course, thay are goos unadorned as well.
Bottom line, I find myself using ketchup on my fries less and less these days.