The idea behind the Halloween movies was that they would be a series of unconnected horror movies (other than that they were set around Halloween obviously), sort of like a feature length Twilight Zone. The idea was abandoned however after the third movie tanked and they went back to Michael Myers.
Which really sucks because HALLOWEEN 3 was the only good movie beyond the first that was worth a f**k.
I thought it was a great film and yeah, the Twilight Zone concept would have been an interesting path to go down.
Instead of the repetitive crap sequels we got.