Not sure anything regarding Bitcoin hasn't been discussed to death.
In this case, perhaps because there's no easy yes/no answer to it. I'm an opponent of Bitcoin and cryptocurrency in general. I find the environment important. However, I can attest there are valid use cases for cryptocurrency. I don't think there are valid use cases for me (a European utilizing the EUR who's not interested in tax avoidance or buying illegal utilities) though. So for me cryptocurrencies are not only irrelevant, they're harmful.