Advantages:
1) Independence from translators. You will effectively bypass any form of censorship, political bias, personal opinion and many other such things by reading and listening and making up your own mind.
2) Reinforce your critical analysis by practicing structure and gain an edge over people who stick to rote memorization.
3) Access to any form of entertainment, technical, educational and scientific media produced by the jps without having any of it "curated" for you.
4) Hopefully turn out to be a better individual than 100% of the unbearable "expats in japan" community, irl and online.
Disadvantages
1) Useless lingua franca language, only spoken in that cursed set of islands
2) You'll have to chance and brave upon countless of bog standard retards looking to visit japan just to consume their "superior" entertainment product and brag about it
3) The language makes little sense, there's no ignoring this fact. It's a pity we don't learn this shit from an early age,
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Advantage 5: You can actually talk to JP holos, nijis, etc etc. You be one of the Overseas Guys that shows up to a meet and greet event speaking Japanese and maybe make an impression. You want to get nihongo jouzu'd by your oshi?
Disadvantage 4: You have an entire new geographical region of delusional autists, spergs and retards you can understand now.