I have to disagree with you there...first you fine a weapon, then you gotta find a good one. You find one on the top tiers available. Well one has more damage, but the other has better sharpness...and this third one has element. You need to then decide what's your top priority. So maybe damage is priority, but the one with the most damage is only green sharpness and you can't deal with anything less than blue. So now you need to balance that again. OK, you found a decent balance. There's three left. Now you need to figure out what element you want. You figure out which one you don't want, which leaves two. Now decide which monster you'd rather not grind, and you have your weapon...for now...until you can fight better monsters, then you're going to need to make this decision again. Also, if you're very good at planning, you'll go as far as to map weapon upgrades, how feasible they are, when you can get the upgrades.
Think you're done yet? Not quite. You also need to figure out your armor, which does have a lot to do with your weapon. You gotta figure out the best skills for your weapon, which armor has the most of those skills, how many slots are there, how you can best fill up those slots, what elemental weaknesses your armor has. You might even want to get two ideal armors for one weapon so you can deal with more monsters. Then you gotta upgrade all this stuff.
If you wanna main more than one weapon (and you probably do if you want to be efficient) then you gotta do this all over again. And every time you raise in rank, you need to double check all of this because you might be doing it all again for both weapons.