in the double slit experiment tho very DIFFERENT **** happens if you are not there....

ie you get an interference pattern and the photons seem to go thro both slits..

even if you measure AFTER the slits it effects what the photon does at the slit...

as for the cat (even tho i think dechonherence explains why it is one or the other)
it is not something that can just be easily swept under the carpet as obvious..