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What you say is correct (10 range) and is the IDEAL but it's not feasible to maintain in game even for the top players.
It's a micro sink wanting to stay at 10 range all the time instead of just "hugging" people at 0-5. You have to understand that the 10 non drop off dps is basically there to not go overboard with insane sword DPS and later can't hit shit at longer still short ranges. We have already been there.
What you later address is mostly your subjective desires for the game which i think are valid and could be tried but in the current state of Relic i don't think its worthy to spend time trying to rebalance weapon dps profiles just for the sake of "it's more logical".