|Taja the Barbarian|
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Access is limited by rarity, and you do not have access to 'non-common' weapons unless something specifically states that you do (an ancestry feat or a GM's house rule).
Core Rulebook pg. 637 4.0
In the case of the Elven Branched Spear, all fighters are technically proficient if they happen to find one (it's a Martial Weapon), but fighters without access can't just purchase them from the local shop: They'd most likely have to loot one from an opponent...