The view obviously does have “implausible” implications, if that means “implications that conflict with what seems obvious to most people at first glance”.
I don’t think what Knutsson means by “plausible” is “what seems obvious to most people at first glance”. I also don’t think that’s a particularly common or plausible use of the term “plausible”. (Some examples of where “plausible” and “what seems obvious to most people at first glance” plausibly come apart include what most people in the past might at first glance have considered obvious about the moral status of human slavery, as well as what most people today might at first glance say about the moral status of farming and killing non-human animals.)
Few people agree that “pleasure” and “happiness” are totally worthless in themselves.
Note that Knutsson does not deny that pleasure and happiness are worthwhile in the sense of being better for a person than unpleasure and unhappiness (cf. “What about making individuals happier? Yes, we should do that.”). Nor does he deny that certain experiences can benefit existing beings (e.g. by satisfying certain needs). What he argues against is instead that pleasure and experiential happiness are something “above” or “on the other side of” a completely undisturbed state.
As for the claim about “few people” (and setting aside that majority opinion is hardly a good standard for plausibility, as I suspect you’d agree), it’s not clear that this “few people” claim is empirically accurate, especially if it concerns the idea that pleasure isn’t something “above” a completely undisturbed state. The following is an apropos quote:
The intuition that the badness of suffering doesn’t compare to the supposed badness of inanimate matter (as non-pleasure) seems very common, and the same goes for the view that contentment is what matters, not pleasure-intensity [cf. Gloor, 2017, sec. 2.1]. There are nearly 1.5 billion Buddhists and Hindus, and while Buddhism is less explicit and less consequentialist than negative utilitarianism, the basic (though not uniform) Buddhist view on how pleasure and suffering are being valued is very similar to negative utilitarianism; Hinduism contains some similar views. Ancient Western philosophers such as Epicurus and some Stoics proposed definitions of “happiness” in terms of the absence of suffering.
I don’t think what Knutsson means by “plausible” is “what seems obvious to most people at first glance”. I also don’t think that’s a particularly common or plausible use of the term “plausible”. (Some examples of where “plausible” and “what seems obvious to most people at first glance” plausibly come apart include what most people in the past might at first glance have considered obvious about the moral status of human slavery, as well as what most people today might at first glance say about the moral status of farming and killing non-human animals.)
Note that Knutsson does not deny that pleasure and happiness are worthwhile in the sense of being better for a person than unpleasure and unhappiness (cf. “What about making individuals happier? Yes, we should do that.”). Nor does he deny that certain experiences can benefit existing beings (e.g. by satisfying certain needs). What he argues against is instead that pleasure and experiential happiness are something “above” or “on the other side of” a completely undisturbed state.
As for the claim about “few people” (and setting aside that majority opinion is hardly a good standard for plausibility, as I suspect you’d agree), it’s not clear that this “few people” claim is empirically accurate, especially if it concerns the idea that pleasure isn’t something “above” a completely undisturbed state. The following is an apropos quote:
(On Buddhism and Epicureanism, see e.g. Breyer, 2015; Sherman, 2017; and the recent review of minimalist views of wellbeing by Teo Ajantaival.)