Because Trezor doesn't control the iOS app store?

What purpose does a hardware wallet serve? What security does it offer?

It provides an electronic and secure mechanism to store your private keys and sign transactions, while retaining confidence that your private keys will not be compromised while using the device. Think of it like a YubiKey. It’s not all that different.

It also enables you to export those private keys so that you can keep a backup in the event of a hardware failure, because all hardware eventually fails.

It doesn’t lock you into their platform / ecosystem exclusively. It doesn’t prevent you from using that backup elsewhere.

This is called blaming the victim. It takes a lot for someone that got scammed to come forward publicly with their story. And it helps others not get scammed too.

Trezor advertises itself as the most secure way to store bitcoins, yet he lost all his bitcoins. Not sure how you concluded I'm blaming the victim here.