Drills and saws don’t depend on an operating environment that changes constantly. Imagine if your drill and saw relied on an electrical source that got updated, requiring them to update the saw and drills themselves. Would you want to buy it with a one time fee, knowing that it could mean they go bankrupt? You’d end up with a drill and saw that no longer worked — then for no amount of money, subscription or otherwise, could you do what you wanted to do with it.