I think they could do pretty well just not adding bubble gum or whatever nasty flavors the prep has. Sure it'll still be unpleasant and salty, but burping up that nonsense all day really doesn't make it better.

By far the worst part. By far.

Though having to push out a huge fart at the request of the nurse while they stare at you when you wake up is a close 2nd.

This may be regional but I just had pills. It was fine. My first one had that terrible salty liquid and I cannot stand the salt. I had a very hard time with it, despite adding some flavoring. I just can't drink salt water. So my second one I got pills and it was miles and miles easier. Now the hardest part is fasting for a day.

When I got my second, I had a bidet and it made a huge difference. That and a bit of vaseline to prevent too much irritation. It's an uncomfortable process so taking every win you can saves your sanity

I really didn't mind the prep experience. I can't say it was pleasant, but not a big deal. For me the worst part is the risk of perforation: it's rare but adds risk to the procedure.