Great suggestion! I’m using an iPhone 6S running iOS running iOS 14.4.1 and the magnifier wasn’t turned on by default. To get it turned on, I had to go to Accessibility and find it under the Vision group. Once turned on, the magnifier showed up in the Utilities folder on my Home Screen (haven’t figured out how to add it to my Control screen yet - am an ignorant iPhone newbie).
I don’t think that the iPhone 6S has any significant OIS (optical image stabilization). It’s amazing how much I can magnify stuff even on an iPhone 6S - I wonder if the iOS magnifier is even better on a newer Pro Max iPhone with super-duper OIS? (looking forward to finding out come September/October!).
Edit_Update: The iOS Magnifier can be turned on and added to the Control Center independently of turning it on under Accessibility settings. To just add to the Control Center and not to the Utilities Folder, go to Settings, Control Center, scroll down the page to the list of available functions not added to the Control Center (the ones with green “+'s” in front of their labels in iOS 14.x). Tap Magnifier and it will go up the group of functions that appear in the Control Center (the ones with red “-'s” for removal, if tapped). By tapping and holding on the “stack of plates” to the right of the Magnifier label in Control Center, you can move the icon higher up in the array of functions that appear on the Control Center screen when it’s launched, if you want.
I’ve only been an iPhone user a little under 5 months. My wife has been an iPhone user since the iPhone 3G in September of 2008. The other day about something else I was like, “You know, open the Control Center…” She had no idea what I was talking about! I said, “If you have a Touch ID iPhone you swipe up from the bottom. Face ID, you pull down from the top right.” She’s like, “Oh, yeah. I might have accidentally done that a time or two but I always ignore it.” So I mention how to access Control Center if there is anyone else out there like my wife who sticks to the very basics.