As per the title. If they don't, is there any reason a caster couldn't hurl more than a dozen colossal-sized weapons with the spell; assuming said weapons are at hand? It just seems odd to me that, with a dozen or more successful to-hit rolls, one could deal as much as six times as much damage as a conventional blasting spell of the same level (such as cone of cold). Am I missing something or is this legitimate use of Telekinesis?
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Weapon proficiency or size has nothing to do with telekinesis. Just total weight and the number of objects.
Yes, you can use up to 15 weapons @375 lbs (lvl 15) in this manner. A typical CR 12 monster has 27 AC, or 25 with minions. A 12th wizard will have 6 BAB, 5-7 INT bonus, you'll probably have +12 to hit with each object. Less than half of the objects are going to hit, most likely. Telekinesis used in this way passes SR though, and that is a big point in its favor. But then spells like Cone of Cold does area affect, and that will easily tip the scales toward it.
If the target does have a very low AC for whatever reason, giving a reasonable chance for all the objects to hit, then yes, it does better damage for sure. But for such low-AC monsters, you're probably better off casting something smaller or nothing at all.