I think this metaphor might actually be able to be stretched a little more. Even as an organism purposed only to serve us, the fact that us humans change means that we're likely to be better served by something that can change with us. Just because you liked it as a baby and think it is best able to suit your needs as it was, doesn't mean that it won't be better suited to serve your needs as a functional adult.

I think people are afraid of change, not because they know it is not in their best interest, but mostly because they aren't sure, so the status quo seems to be the safer option. It's why humans are averse to change in a lot of scenarios, we sometimes have a little bit of trouble with the long term perspectives.