I don’t have a horse in this race, but after having been an ardent opponent of the IOS ecosystem for years, it does have some significant benefits for the average user (and some significant pitfalls - Itunes PC desktop…).
Rather than get into the minutae of that though, the main benefit that I’ve run into is that all the devices operate consistently - whatever the type of phone, phablet or tablet, they all look and feel the same. Not so critical if you use one or two, but very useful if you run them for product demos, taking payments and illustrating apps in a few locations. I know you can emulate the same principle by sticking with one supplier of android phones and tablets, but (quite apart from the lack of integration of an accessible hearing aid connection) the look and feel of the Google Apps just doesn’t ‘sell’ as well - even if you ignore the underlying GUI.
I’m no fan of Jobs’ mantra, but making a ‘just works’ product with a minimum of fuss for your average boomer who doesn’t have a technical bone in them, is quite an achievement.