It's competing at the wrong level.
The iPhone is a toaster. Nobody's up in arms about whether the toaster takes other manufacturer's crumb tray. It's a television, and nobody's demanding QLED and OLED be swappable. It's a console. Xbox doesn't play PS5 games. It's fine.
There's no real line between hardware / firmware / software / malware ... For what Apple offers consumers, every layer of whateverware should be trusted.
Drawing imaginary lines based on the embodiment or substrates for logic gates is mistaken.
There are lots of phones. Lot's of different philosophies. Stop taking away consumer right to pick a philosophy and design for an end to end experience. It's fine.