If you want to know about the bitcoin then why are you mentioning altcoins in your title! I dont get it !
Anyway, on the discussion front its main issue is legality of using all the crypto's. Its not just about the bitcoin or altcoins and its neither about their characteristic but a simple fact that is "non-acceptance" by the government. See, if they accept it one day and if devs see bitcoin/altcoin are being used as mainstream application then obviously rest of the developments will follow and things will be recovered in zero time. So thats the bothering thing or major disadvantage of it, we need ruling body!