I didn't say they're not worth it, but it's way more of a call out to use his counters than Haz 2A, are you kidding. 2A is still an attack; if I decide to just block on your wakeup, now I'm in pressure. You do that to me, I am sitting there like a retard and going to eat a huge combo. His 2A is also one of the fastest, has a great hitbox and with iB you can pretty much punish a ton of blockstrings. You don't need to guess between throws, highs or lows either.
But yeah, part of the reason I like to use counters is because they help condition the opponent. (But so does a lot of other stuff.) It is also the only way out in certain situations. For instance, sometimes just blocking a move means you are in trouble now, and a counter is the only way to push your advantage.
Really it just boils down to personal preference, not strategy though. I mean, they keep nerfing it every game, if I was using them purely because of how great they were then I would just block all the time. I just enjoy making it a RPS game.