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Ah.

I'm not exactly an expert (or even well-versed) on much metagame-related, but I'll try.

My Pokemon's nature, apparently, draws it towards having a higher Attack and lower Special Attack than usual. Its behavioural trait gives it a boost to Special Attack, though. So the nature and trait cancel eachother to a degree, essentially giving my Pokemon a boost to Attack without any drawback.

The extra attack is great because it gives me a wider range of moves to choose from when it comes to decking out the Pokemon and thus more options in-battle.

A Charmander I hatched a few days ago got this

+ Attack
- Special Attack
+ Special Attack

overall.

So it essentially benefits from Charizard's usual exceptional Special Attack while also having a higher-than-average Attack. Not as good as extra Speed, perhaps, but having the flexibility to rely on contact or non-contact attacks is great.