If you really do some digging you can find a lot of reasons why not to use Zcash, some of it legitimate and some of it conspiracy. But I'm mainly concerned for 2 reasons:
A: Because it had some potential vulnerabilities when it was set up, and it may not be as secure as people think if there was any corruption by the devs. You might want to check out this article and this one too.
B: There may be a backdoor accessible by the devs and/or government. Could it be just an idea, a de-anonymization backdoor, or something else?
just read those articles, the tweet was the most troubling, thanks for the links.