They are inherently, fundamentally different. Think of this from the perspective of the one defending instead.Flame body and static are the same as dire claw but just in the opposite interaction getting hit instead of you hitting the opponent while praying for the proc, there are not skill behind that, just fish for the proc. Personally I don't think those things need to he banned since both have ways to get around them Vengeance already quoted what could be done about dire claw and for the other two is avoiding using contact moves, both options are avaliable for players on teambuilding and during the matches so I don't get why would dire claw be considered uncompetitive but those abilities not. In the end of the day the 50% of dire claw gets reduced to around 34% of rolling a strong status because regular poison sucks, which is almost the same as the other abilities.
Static and Flame Body are something you react to. If someone switches in Zapdos, you're only going to be Paralyzed by Static if you make contact.
In contrast, Dire Claw is something that is proactively done against you. It's a highly spammable move that you can use to fish for status (Even regular Poison can be significant even if it's the weakest result so there's no need to downplay it). To defend against it in a guaranteed way, you have to switch in a Steel type who doesn't want to be anywhere near its Close Combat, or literally just Gholdengo. And of course, there's the fact that it's a 50% chance for a status instead of 30%, and it's the only one that can inflict the strongest status, Sleep.
Again I do NOT think Quick Claw is worth sweating over this is a big red herring fr let's focus on what matters here