I tend to agree with you that it's probably a matter of "how much oil is used", but over the years I'm aware of so many having problems after using it that it's just not recommended.

So many people think "if a little is good, using more must be better". And that goes for all kinds of things. A hair care product that I've used for years says to use only one DROP of it, yet you can find ppl ranting & very unhappy because they paid no attention, used too much & had bad results. So there you are, lol.