Float is actually super useful since he has prolonged flight forever. He never needs to touch the ground, which screws over those with flight. Before float he was limited to just leaping very good, but with float his mobility is far better.
Smokescreen seems underwhelming in a vs battle setting only tbh. In verse? That quirk shuts down hella characters. Not many people can just sense him through the smoke, and quirks that rely on sight are completely stopped. It is, however, the easiest quirk to get around definitely, as shown with Bakugo just blowing it away. Unless there’s more to it than what we’ve seen, it’s not doing much in a final battle scenario.