Apart from the reason to switch outlined above, I believe there are many Android phones which are better. I know people who have used iPhones will have to learn to use a new system, but it is not difficult and you will not regret changing.

An iPhone Xr was my first venture into the Apple iPhone garden.  Due to a combination of relatively minor mechanical damages, it failed due to water ingress.  Having thoroughly enjoyed that phone it was only natural that I would advance to an iPhone 12.  Apart from a couple of software functions that are related to operator settings, I am very happy with it as a mobile telephone, a web browser, an email portal, still camera, video camera and SMS device.

In normal use, I do not expect it to need to be serviced by anyone.

Letting third party repairers into a premium product would be similar to taking a near new $80+k BMW/Mercedes/Audi/Lexus to your suburban backyard mechanic.  Even companies such as Mazda, Toyota and Honda spend tens of thousands of dollars in training dealer mechanics on the introduction of every new generation of vehicle.

All of the subsections of the iPhone as shown in the video are stand alone electronic devices in their own right with dedicated programed ICs carrying out their designed functions.

I could imagine that if this YouTuber had grown up in the era of mechanical clocks, the home would've been littered with dismantled ones as he sought to reinvent them. He now makes his money from the millions of views of his videos and sale of second hand (reassembled) devices.

So many phones to choose from, most very good ...

however I stick with iPhones because of their seamless compatibility with my MacBook Pro laptop.