He has 112, which is an overhead, he has a great mid B1, an autoshimmy string in 212, a godlike poke in D3(have you noticed the hitbox extends further than his foot?) that jails into 212, great damage and a solid AA in D4. His strings are good too...
What he suffers is what most of the great majority of the cast suffers, the presence of characters, in their current state, like Johnny Cage and Jacqui for example. Bring those characters down and you'll see other characters, like Noob, to make their stand as strong characters in this game.
People play SD, other than personal preference, due to the threat of a low and an hard to punish move, that's it. The variation doesn't offer much more than that, it's also easier to play and offers "safe" neutral options with the slide. Other the other hand, DS has more to offer that just a slide.
The "thing" that might people feel uneasy to play with DS are that his combos, optimal, aren't straight forward to learn, they need micro walks/dashes. Trust me, DS hits like a truck, as access to a restand using B1,1+2 xx BF1, which leaves you at +5 on hit and each time he touches he's going to hurt.
PB is just inferior, Snag doesn't work standing, which limits his combo routes, Sickle Toss is hella slow...feels incomplete.
I think your assessment is incorrect. This character only needs another viable variation, because he only has two, while other characters, like Jacqui, have 3 that are viable.