It seems the reason for your disappointment was lack of research. If you knew you were going to use it with projectors, I'm not sure why you wouldn't look into that, especially since the Macbook Air only has thunderbolt.
Probably because he assumed that it would work the way it's supposed to. Should he also have researched whether the power cable actually charges the batteries?
Probably because he assumed that it would work the way it's supposed to. Should he also have researched whether the power cable actually charges the batteries?