I think Occam's Razor is useful as line of thought because the Universe is probably rather effective (perhaps as effective as it can be?). Why would it be effective? Not sure, maybe God (in some form)? If a thing is as effective as it can be by some laws of operation then anything else but the necessary parts is superfluous and thus flushed away by its ineffectiveness. For those familiar with Danish cartoonist (among other things) Storm P. then that is a good example of ineffectiveness... the Universe would probably not look like that for reasons I would not be able to answer. We, ourselves, and things around just seem to rather effective in some ways. Perhaps that is a guiding point to the Universe also being effective, and if we are to assume a supreme creation then perhaps it is as effective as it can be.