Honestly, there's nothing wrong to being an end over end roller. Look how many titles WRW has one with playing mostly straight, end over end roll.
Right now, because of the pattern/volume you're bowling on, being end over end maybe be suffice for you. But, when lanes break down or are drier, having a low tilt and rotation can give you issues getting down the lane since your ball is already standing up. Plus, today's bowling ball hook too much already. Companies are making stronger and stronger balls, but lanes and oil don't change that quick. Then you have bowlers who want more revs....
Anyway, it is good idea too to learn to change your axis rotation, add more side roll to your game. Even increasing tilt (spinner) too helps widen your game especially when lanes are dry. You're prolly like WRW at release, what these folks are telling you is be like PDW. That's a good thing.
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