Not only Mediatek chipset but you can buy budget Chinese phones with more expensive chipsets too.
What Chinese people understand is business, you can buy a Chinese phone with a non removable battery and you can find it on Aliexpress.
If you buy an iPhone, you may NOT replace the screen or the battery unless you only go to an authorised Apple store, and I read too many stories of not reparable phones which requires replacement when then they were repaired by an independent technician.
But what is doing now Apple is locking screens and batteries with a digital a code that must matches with the one embed in the board that only an authorised center is able to unlock.
And Apple buys the phones from China, call it monopoly!