Jeff it is just a guideline. Sure, it is based in a lot of years expeience, but it is a guideline. Every set up is different and requires or can allow some amount of tweaking.
There are limits. The lighter the arrow vs bow weight, typically the faster it goes and the louder the shot gets. Faster usually means flatter (not always, especially at short or long ranges). In this case faster COULD cause bow damage, but that is usually at < 6 or 7gr/lb, maybe lighter, as you approach dry fire conditions.
The heavier the arrow vs bow weight, typically the slower the arrow flight and the quieter the shot gets.
But. . . my bow at 60# and your bow at 60# are NOT the same and they each require different feeding, care and nourishment.
Try different things out on your rig and decide for yourself. Deer are not that big or tough of a target and you can get by with a lot of different variables.
ChuckC