Imagine asking a person a math question like what 2 times 3 times 7 is (without you knowing the answer). If that person immediately goes like „42“ you‘ll most likely think that it’s a joke response and the person doesn’t take your question seriously. If however that person takes a few seconds to think you are much more likely to believe the answer.
Classic snaps are not and a lot of snaps are classic. That much is true. Some snaps are indeed confined though. See https://snapcraft.io/docs/snap-confinement