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Not just that, the first iPad had an official "keyboard dock" accessory - a desktop-style keyboard with a built-in iPad stand and 30-pin connector:

(For the record, this was in 2010, the same year the camera adapter you mentioned was released, as well as OS support for Bluetooth keyboards.)

E.g. - this comment, via a Bluetooth keyboard on my iPad mini 2 :-)

Missing is the ability to use a mouse to supplement touch, which I could do on my Android tablet before it died.

Yep, and pairing a Bluetooth keyboard would work as well! I knew many people who carried around an iPad and a Magic Keyboard to use together.