A few of the horses I cared for at the barn I used to work at refused eat those electrolytes in their grain, or drink it if I mixed it into their water.
If horses don't really like it I can't imagine humans fairing much better.
I get bulk electrolyte powder for my hangovers and it tastes like salty weirdness. That's probably why every electrolyte drink has flavours and sugar to mask it.
That's exactly the reason for the over-the-top flavorings. A while back I looked into making sports drinks myself and getting ingredients in bulk, and you're basically drinking dissolved salt, saltpeter, and Epsom salt.
Yeah Gatorade was literally just a few professor types going "Hey you lose a bunch of salt and water through sweat and sugar through the exercise, maybe the best drink for athletes is something that replaces that?"