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2" eyepieces are only necessary for wide angle low power eyepieces where the light cone is too big to fit through a 1.25" tube otherwise the smalleer tube diameter works just as well.
Some people try to use 2" exclusively as it saves fiddling with the adaptor when switching between a 2" and 1.25" eyepiece but I would consider this an expensive exercise for no gain.
Basically get good eyepieces in the style/size that works for you and forget the 2" v 1.25" issue. If it works then its right.
Keep looking up.
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