This is still a blanket statement made with your experience with 5 ball pythons.
Like people, not all ball pythons do the same things, and or act the same way.
If a ball python is in 50% humidity and lower, and is going into shed, and you provided it a bowl to climb into, many will soak. Maybe yours don't, but you can't say others won't, it's just not true.
If your humidity is like most of my tubs, and closer to 65% to 70% then no, most won't soak.