Nobody ever explained you to me.

Dead and alive describes the indeterminate state prior to observation in terms of Copenhagen and Heisenberg. Without that semantic distinction, the two slit experiment would fail.

When I let my dog out, I don't observe what goes on in the garden but the status of any local cats daft enough to hang around can only be guessed. Observation leads to knowing what you shouldn't wish to know and someone well and truly in the dog house.

Schroedinger made his point but only in trying to dismiss what later was recognised as a key plank (Planck?) of quantum mechanics. He later regretted it, sd did Einstein for egging him on. All there in myriad history of science books should you need to go beyond the default position of trying, unsuccessfully, to take umbrage at anything I type.