Apple's security model believes the user is untrusted and a security risk.

A security risk to their business model.

Their business model being making devices that are easy to use and hard for the user to mess up.

...and where all software is delivered through them, so they get a cut of any sales. I don't begrudge Apple the ability to make money. I do begrudge them for how they completely monopolize it, and try to present the security argument as if it's a binary choice, and not a spectrum along which there might be a solution different than we have currently which most people might consider better.

Easy to use is debatable. There are so man hidden gestures.

You don't need to know those to use your phone, though.

You don't need to know in android as well. It's even easier.

That's a false equivalence. An iPad is not a Mac, it has a different security model and a different way of using it. The iPad is more locked-down than the Mac and always will be. Allowing people to disable protections on the Mac has no bearing on whether they should be able to disable them on iPad.