I’ve had their 2.1 computer speaker set for nearly 20 years at this point. The only issue I’ve ever had was crackling when adjusting volume, and that was caused by dust inside the knob. WD-40 to fix. Love them.
It’s the first thing I do when installing a new app, as most prompt for it on first launch, and I reject it immediately. I can always allow them later, but it’s been my default mode since iOS started letting you control them.
For email and work IM’s, my phone shows only the badge, no sound. Signal, SMS, and the phone app get sounds, too. That’s it, silence on everything else.