I take a lot of shots from 20 pound bows with bare fingers teaching teachers, parents, and kids. Millions (15 million actually) of kids have been taught to shoot bare fingers (and barbbow) in my organization since 2002. However, most of their shooting sessions involve only 40-60 shots in an hour.
However, I have never shot a hunting weight bow, of any type with bare fingers. Don't intend to even try it. I find lots of ways to hurt myself without doing so on purpose.
I keep a spare tab (broken in) in my pack. There have been a couple of times I've had to use it because I forgot my number one or dropped it.
Honestly, in all these years I've forgotten or almost forgotten (got to the truck) my bow more than my tab.I've come home a couple of times when I parked and the bow wasn't in the rear seat. Good thing I can be in my favorite stand from my back door in about 15 minutes (counting a shower!).