You might be on to something there. Small sample here but most of my colleagues over the years had sennheiser headphones of some sort. Occasionally they’d step out to another brand and come back again. I’ve still got some HD25’s knocking around that I don’t use as well.

However we all use AirPods now.

Also sennheiser earphones were all trash.

Too much marketing involved in this business. And then too much competition from China? Not sure whether the masses are aware of the good but cheap China items. BLON BL-03 , how can you compete with that?

I have a pair of those but I have struggled with finding a good bluetooth cable/adapter, would you mind sharing your setup

I think the story starts with Beats. Sennheiser missed a trend or was late to adopt.

I think that it has more to do with Samsung who intended to cross-polinate their medical and consumer audio products. So, Apple might be the cause but one step removed.