I agree with all your points except the fourth. Once outside the atmosphere and up to speed, rockets are actually pretty efficient. The space shuttle main engines achieved 15% propulsive efficiency if I remember correctly; this is better than many land vehicles.
I've studied launch loops and they have massive power requirements, on the order of magnitude of heating up the atmosphere significantly (up to a degree or so). Space elevators can be efficient, if the power delivery system is efficient, and so far all workable proposals (laser power beaming, conductive cables) seem extremely inefficient.
Rockets are in many ways the ideal space launch system, the major disadvantage being enormous unit cost.
Once outside the atmosphere and up to speed, rockets are actually pretty efficient. The space shuttle main engines achieved 15% propulsive efficiency if I remember correctly; this is better than many land vehicles
Yes, but getting out of the atmosphere is really inconvenient.
Do you have a citation or a back of the envelope for the statement about launch loops having such large power requirements? I don't think I've seen that before, and I'd be interested in seeing that.
Hopefully at least one or two would show a virtue of non-straw rationality.
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