It seems a little silly to complain that a feature is missing from headphones when it actually exists, but the user has made an active choice to include a different feature instead. With always-on listening and easy activation from phones these days, I can't help but think that there's little reason to use the button to activate a voice assistant anyway. Not least of which is the dubious usefulness of voice assistants.
Do I have the QC35 II's or something then? There's a button on the side of mine which will change noise cancellation level.
At any rate, yeah, there are annoyances for sure. Keeping open two connections rather than having to switch is a definite improvement, IMHO.