I think the issue is, and this comes from a USBC coach and one former pro bowler out here that was talking to my wife and another bowler.
Comfort and such is great, but at some point you will be vunerable with the lanes transitioning and not being able to control your ball enough. At some point it will plateau and you can be very good, but you wont be able to improve upon it much without using your thumb. Why limit yourself for the future by sticking to what is comfortable now at the expense of getting much better for you later.
there is a reason you dont see pro bowlers using this technique.
Having said that. At the end of the day there will always be exceptions. But like someone else said, if i didnt use my thumb i would bowl two handed long before switching to thumbless one handed bowling.
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