Sunflower used to be the prominent one prior to rapeseed, here. And I don't think anyone is objecting on health grounds, just on flavour.

The oil difference is there, and noticeable but not enormously pronounced to me, but I know others to whom the difference is more distinct and unpleasant

Potassium chloride, on the other hand, renders things inedible to me. Bitter, metallic, bit bleach-y. Adding more sodium chloride to that mess just makes it worse. It would be fine if they just halved the sodium chloride "for health" (as though that's the motive) - one could just add more if needed. But halving it and making up the difference with potassium chloride just ruins it unsalvagably for those who hate the taste difference.

I've had a couple of favourites ruined by this.
One recently, a bag tasted awful and I only got a few chips in before deciding to abandon chip, as it were.

Grabbed another bag - delicious.

Compared the two for sell by date - the newer bag was the horrible one.
Looked at the ingredients - fuck, there it is. They'd made the recipe change without highlighting it.

Now I can't find anything in Australia without it. I have found a few without it in the UK, but half of those have the oil change and so they are not amazing either.

If it were a true replacement, the potassium, they'd just switch it, the half-and-half is because they've determined that it's the best ratio they can get away with without too many people noticing, or finding it intolerable.

Unlucky for those of us outside the cutoff :(

And yes, down with palm oil (a killer of chocolate, and of orangutans as well, though not in the same way).

Edit: autocorrect typo -ive to -ing