If it makes you feel any better, the people providing these calculations to the pilots are FAA-certified airline dispatchers. That means they've passed the same

If it makes you feel any better, the people providing these calculations to the pilots are FAA-certified airline dispatchers. That means they've passed the same exam that airline pilots have to take, minus the flying. They may not have personal experience flying the airplane but they do have to know it inside and out. And if the dispatchers weren't running the numbers, the pilots would be running them using the same software and/or tables, so there really isn't much difference.