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They do make 3 and 4" EPs. hehe. But there is no advantage to 2" over 1.25" until the field stop exceeds 27mm, i.e. it no longer fits in a 1.25" barrel. That means that 1.25" is fine for super wides (65 degree FOV) up to about 24mm or ultra wides (80-deg FOV) up to about 20mm.
Where a 2" EP makes sense for a 10" f/5 is at the lowest power end, i.e. super/ultra-wide at 27-34mm.
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