As a rule, i do not tailor my treasure to the PCs. I tailor my treasure to the NPCs and the game world.
If they are adventuring in an area where the typical guard and soldier are armed with shortsword and spear, the most common weapons found as random loot will be shortsword and spear.
If they are fighting orcs and the orcs tribe uses greataxe and crossbow, then they will find as GEAR more greataxes and crossbows.
If they are fighting barbarian raider orcs who get their gear through theft more than anything else, they will find as gear arms and armor common to the other locals, say the sword and spear of the local guards above.
My players understand a simple thing... exotic means exotic... so they do understand that if they spend feats on exotic weapons like dwarven waraxes and bastard swords thats all well and good but these weapons, ahem , being exotic will be fewer and farther between than say a spear or a shortsword or an axe.
This doesn't mean they CANNOT find them, just they cannot find them commonly.
My monk player went through trials and ordeals **LITERALLY** to convince a LG order of heironean monks to sell him a MW kama, since he could not find MW kamas for sale in general weapons stores in the city. My dwarf player with focus and spec in dwarven waraxe finds that in this human city there are not enchanted dwarven waraxes for sale, but fortunately since he HAS a MW dwarven waraxe on his own he can commission enchantments...errr,,, enhancements.
When my party finds a magic item they cannot use, they sell it for typically half value and use that to buy something more useful to them. This does in fact result in weaker but more appropriate items, when they can find them.
All in all this means... the fighter who specializes in one weapon type with multiple feats finds himself more limited in what he can find useful. The fighter who instead spreads his feats around and uses whatever weapons fit best will be able to use more.
Remember the fighter class gets proficiencies in ALL martial weapons. If the Gm does not bend over backwards to tailor treasure, the players who instead see the class as getting "all the feats applied to one weapon" will actually realize that ALL MARTIAL WEAPONS is an advantage.
In the game i play in, my elven fighter is swinging a greataxe. Did he start with a greataxe, nope. But he found a +1 greataxe and now uses it with gusto. If he finds a +3 club, he might well switch to it.