If it ain’t broke, don’t fix it.Bose has done exactly that with its QuietComfort line of noise-cancelling headphones — and for good reason. The QC35 and QC35 II set the bar for active noise cancellation (ANC) when it comes to wireless over-ear cans. Bose’s powerful ANC blocks out more ambient roar than nearly all of the competition and the QuietComfort’s reliable controls meant they were a joy to use on long flights. Still, the QC35 II debuted in 2017 and technology has progressed a lot since then. Still, Bose managed to keep most of what made the line so popular while making a few minor updates with the QuietComfort 45 ($329). As it turns out, you don’t need fancy new features to make your headphones unique.DesignIn terms of aesthetics, there’s almost nothing new to report here. Bose was clear that the idea was to keep the trademark QuietComfort series design intact. The company did remove the pleats around the ear pads to clean things up, and it closed open spaces f