This is fair. I guess I'm mostly thinking in Brewers terms of letting a pitcher approach free agency and then trading him, not necessarily in the "they need to sign this guy to an extension" frame of mind. Whatever happens will happen.
In general I just get annoyed at flippant comments where commenters (I'm thinking like comments on twitter or on youtube highlights) just say, oh he's going to blow out his arm doing that. Sure, that happens a lot to pitchers. I'm just not so sure that Miz is super duper extra susceptible to injury than other power pitchers. He could get injured in his next start (knock wood) and that wouldn't really change my mind on the thinking process behind it.
In the end, when I watch him pitch I'm not thinking, this guy is going to blow his arm out. I'm thinking, this is really cool I'm glad he's on our team.