A lot of people feel like stuff tastes worse than it used to, too
That's obviously hard to measure because you can't do a blind taste test of a 20 year ago candy bar and one today, and people's tastes change as they get older. But worse ingredients making a worse flavor is possible too
Over here in the UK at the moment you can. They’ve recently made huge changes to a lot of chocolate products in the space of a year or two. Especially cadburys which is now just at the legal definition of chocolate over here. Any lower and they legally have to call it “chocolate flavoured” which has already recently happened to a bunch of classic lunchbox chocolate bars. So shit.