While I agree with your reasoning (and personally wouldn't bother with such a restriction), there is a good reason and it's that while they're likely good enoug

While I agree with your reasoning (and personally wouldn't bother with such a restriction), there is a good reason and it's that while they're likely good enough to get root, they might not be or simply can't for some reason. And if they can't, then that extra measure could be worth its cost in time and effort.