Hitchcock was, in a way, the best person to remake his own film, so I don't think that point is valid.

However, I'm the type of person who doesn't have a problem with the idea of a remake. Though I think they should only happen if the original film isn't great or if the new film has a new twist on the story.

But Rear Window's just about perfect so that'd be a no on the first one, and, as for the second, there have been a number of films that have reimagined its premise, so a straight remake was highly unnecessary.