Of course not every creature has a hand with an opposable thumb. They don’t need it.
But for every creature that does have such a need there is a commonality that to some people says that evolution is an aspect of a grand design...or else why do forms of life on earth have so much in common?
Features have reappeared in contexts where one never would have expected them to have been genetically carried along... for one thing.
What builds that thumb on that rat, and what builds it on that man? We need to be able to answer the question at this level before we can presume too much.