Not overly simplistic, but that's only one of the factors. You're still trying to funnel a whole lot of very hot gas down a fairly small hole, no matter how long between shots. So rounds like that will still be much more erosive than, say, a .308 or a .223.
Eroded throats and short(er) barrel life are just part of the price you have to accept for the high performance you get.
Still, with normal use, you should get 10,000 rounds before things go to pot.
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