Aero I can't understand, but that rather than heat dissipation I don't!
Two thing, weight, and the flat mount designed for 140mm without adaptor.
The latter doesn't really hold much ground tbh. 160 all around and happier braking. How much more does a 160 rotor weigh anyway
To a roadie, it make a difference.
With flat mount, it just look smarter with the calipers slammed against the fork as oppose to it's sticking out like a sore thumb with an adaptor.
(personally agree with 160mm front).
@Chak started
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Two thing, weight, and the flat mount designed for 140mm without adaptor.