That's really the big thing - "Apple is easy to use." When everything is in their ecosystem, the synergy is nearly unmatched. I'm a PC guy, but I recognize that having Apple products for work computing, home computing, phone, tablet, headphones, watch, etc. etc. makes for a seamless experience. As opposed to Android/PC, where the interplay between hardware is made orders of magnitude more complex because there's, what, a few dozen major parts that make up a device, and for each one of those there's countless options?
Apple is seamless because it is only designed as one device per category, more or less. So the equivalent of going from the XFi I mentioned to these things is kind of like the difference between trying to stitch together a tech stack - components, drivers, etc. - on a Linux box vs. just having the pretty, expensive, easy-to-use solution, if you're willing to give your techie soul to Cupertino.
And yeah, you can get a better overall experience from the more flexible, customizable solutions, but that requires knowledge, and testing, and experience, and most importantly time. And if you can't invest those, you may well get a craptacular overall experience. So the "walled garden" of iOS/iPadOS/etc. becomes inviting as it's just gonna work, and work with other products in its ecosystem, and work with them seamlessly.