What I mean is, in other areas of technology, you can chop and change.
If you like Android, you can buy a large number of different makes of handset. And the chargers are generally interchangeable.
Windows works on a large number of machines.
Any make of TV will work with any make of DVR and they will all display the programmes that are broadcast.
All cars can fill with fuel at all stations.
Visa and Mastercard are both accepted wherever you can pay by card.
But with Apple, once you're in it, it's possible to become quite stuck. Mac OS only works on Apple Macs. iPhones can only be charged with iPhone chargers. If Apple suddenly decide to double their prices, there's not a lot you can do other than completely change the way you work.
I didn't say they have a monopoly, but they have created a pseudo-monopoly of sorts. If my phone charger broke, I can buy one from all sorts of places for a wide range of prices. Apple ensure you can't do that. They also ensure you can't buy any of their products and any different prices. I'm not sure how they manage it, but they clearly fix their prices.
Quite the contrary. If you decide you want to exit the Apple ecosphere, the resale values are absurdly high, compared to any other tech product. Where you get stuck is if you want to sell Windows or Android hardware and exit into the Apple system.
Your argument is a little like complaining that you can't put Ford parts in your Volvo. If the Volvo is giving you grief, sell it and move on. You'll get far more for your Apple hardware than any other similar hardware.