So you can't reflavor (call instead) a Estoc a Rapier. Then enjoy your free exotic proficiency of Estoc by calling it a Rapier?
Sure, I can do that. And to be honest, if I think rationally about it, there's no argument against to do so. Still, from a personal standpoint and knowing, that the only reason I'd do this is for the damage plus, would feel like cheating to me. I also wouldn't choose to refluff a Lucerne hammer as a greatclub, for example, but that's just me.
Now, if a player would ask me for this possibility, I had probably no problems to allow it. Because as long as he's having fun, I'm fine with it, as long as it doesn't ruins the fun for the other players.
Starting at level 1 actually increases the likelyhood of acheieving a +3 weapon and a +4 belt during level 10. The two items together are maybe half of your wealth, so unless you're spending the other half on CLW wands it's very possible.
Barbarians are an odd case, similar to Paladins, in that their tough enough to skimp on some gear in order to save effectively. Superstition, Beast Totem, raging vitality, ect help out your AC and vulnerable saves considerably. If you optimize further into invulnerable rager you get even tougher.
Also if one of your party members chooses to be a crafter...... WBL is decimated.
I won't argue your points, I'm just saying that this is in my opinion not, how the game is originally intended to be played by the designers. I may be wrong, though.
The only thing I'm not sure about is most players saving their money to get those items. Because a substantial lot of their wealth is earned by finding treasure during the adventure, which, if sold, only gets them half the price, they had to pay for the same item. And as they, in my experience, not only spend their money for CLW wands but also for other items they'd like to have, they may not have the money they'd need for those two items at level 10.
And yeah, if crafting is an option, it's a totally other thing.