I have no doubt that #1 played a big (biggest) part in that decision. I'm not sure I understand why that's a good idea though. I'll take your word that the 120s are more accurate, though in practice mortars seem to be more prone to error.
The 105 has a much longer effective range, especially with the RAP round, which is 80% more lethal (not that I would want to shoot it rocket off). But let's be honest, when you really need to break things you use the DPICM round, which I don't think the 120 has, though I could be wrong.
I'd like to hear the argument for precision mortar rounds. Sure it might be fun to have, but with the HIMARS/MLRS and the Excalibur at seems like money better spent elsewhere. Especially since, and this may by due to the Copperhead, I'm not so psyched about laser designation. You can send grids from a cell phone, or a UAV. Not to mention you can do refinements with PSS-SOF and you don't have to worry about dust clouds, etc..
You make some good points and I'll admit I'm not totally up to date on what is actually being fielded with the 120, but with 60s and 81s it seems redundant to me. Whereas the 105 actually fills the gap between mortars and the 155s.
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