"Soft wheels don't slide"
If we're talking powerslides, that's not true. I've ridden wheels from Satori, Spitfire, Bones, OJ, and Powell in the 78 to 85 durometer range and they were all powerslideable. It's a way more resistant slide as compared to a hard wheel, but that's why I got them. I like bombing hills and don't like sliding out.
If we're talking noseslides, tailslides, or bluntslides on ledges that aren't caked in hella wax, I'll agree.
Soft wheels can slide on super waxed ledges on a hot day, but you'll be wishing you had a hard wheel that was made for that type of skating.
I was really hoping to see some nose or tailslides in the 9 Club testimonial video, but it was all board slides. The crooked grind was a good proof of concept, because soft wheels and crooked grinds don't really work. Andy Anderson has video that includes a tailslide, nose blunt slide, and some powerslides, which sold me on them actually sliding like a hard wheel:
https://youtu.be/z9h0oll-RZc?t=10OJ makes a 92a wheel. A buddy of mine could make those things do any slide. I've been told Spitfire also used to make something in that range.
I'm currently riding some Powell 83a wheels around San Francisco. I feel a lot safer bombing hills on the Spitfire 80HDs because they are a lot less prone to sliding out at high speeds. But that limits the amount of tricks I can do at spots, which is a trade off. At times I've just carried a set of hard wheels with me and swapped em at the spot.
If I was pushing through rough flat streets to go skate a spot where I wanted to be able to do any trick, perhaps these Dragons would be a better fit.