The thing is, you can only have one of those at a time ever, unless you're juggling. The discussion is about a permanent upgrade to your whip in one form or another. Like how your boots can get upgraded two different ways, or you can upgrade your bombs.
But isn't that exactly the problem? A slot-free upgrade should not be that much powerful than a weapon that needs holding... Already some people find machete not worth holding at all. How should the update fit it into the existing paradigm without being too powerful?
Or else. I would certainly not reject a powerful upgrade!
How 'bout getting a laser whip from the alien boss? Not that shoots lasers or anything, just glowing whip and a little longer.
That would be pretty cool... although the alien boss already has the jetpack as its loot. (Curiously, I haven't got one "psychic presence" level in the past ten to twenty runs...)