When you perform the measurement on which slit the particle passes through, then the measuring device is also part of the system and it affects it. The measurement reduces the degrees of freedom in the system so there are no longer two equivalent ways for the particle to pass through the slits (either A or B), but rather you now have a measured slit and an unmeasured slit. Since there are no longer multiple ways to achieve the same result, the is no longer interference due to equivalent probabilities.
Matt Stassler has a nice series of blog posts on this.
I don't think it's an equivalent comparison. If you judge McDonald's for their nutrition value, I'm sure all will agree they are crap and this is something that is objective and scientific.
There are people though that say they like McDonald's and buy their food, and people that don't like it and stay away. This is the subjective part. Musical taste is like your taste in McDonald's. Some like McDonald's, some like Mikki Minaj, for their own whatever reason. And it's fine that they like it. It is their taste. It doesnt have to have artistic merit for them to like it, similar to how McDonald's doesn't have to have nutritious value for them to like it.
Nah it sucks. You don't get a fucking notification when someone messages you on a different organization. For fuck's sake.