The iPhone has volume buttons as well but the mute switch was a way to quickly mute your notifications completely. Its honestly the one thing I miss about having an iPhone.

My S23 Ultra does this now. It no longer has the bixby button, but the power button can be remapped. I have it now so that double clicking the power button opens my camera app, but long pressing it shuts off my phone.

Honestly I’m more of a Sync guy, but I have tried Apollo when I switched to iOS for a little bit. While I did enjoy it I actually enjoyed Slide more because I liked the gestures a little better. iPhones are pretty popular (at least here in the states), and Apollo is the the most popular 3rd part app, so it make sense that it’ll be the one you hear about the most.