As a developer, I can make apps for my own device without telling (or paying) anybody and use old devices like somebody else might use a Raspberry Pi.

I can use real Firefox with real uBlock Origin.

I can get free apps from Amazon App Store. I can get verified secure open source apps from F-Droid.

I can use separate restricted accounts on my for kids and guests.

I can use a separate launcher experience for driving without needing to purchase a head unit.

I can watch videos (including the "GIFs with sound" that proliferate on Reddit) with the sound off and on-device generated captions. I can copy text from arbitrary screens, even if that text is in a picture.

I can route all my calls through Google Voice or any other calling service. I can open map links in any mapping app I like.

I can use emulators and native apps for game streaming services.

I can have my photos automatically upload in the background.

I can update my browser engine and a lot of other "system software" without a reboot.

I can use headphones without ever charging them. I can unlock my phone while wearing a mask.

I can filter notifications the same way I filter my mail.

Using iOS would be a massive productivity drain as well as an entertainment drain and security loss. Most of the people I have demonstrated these things to have found one or more of these abilities compelling enough to have switched.