- I've never heard a single person call that format Swiss. It's just plain incorrect to call it that.
- It's actually fewer matches than a true round robin in most cases for most players. (Unless you meant more matches that normal double elim, in which case that's obviously true.)
- It doesn't solve the problem of pointless matches at the end of round robin because you're still doing round robin for part of it. It's just that the pointless matches happen before the double-elim starts.
- It doesn't lessen any chance of catching a lucky bracket. An easy pool is an easy pool regardless of format. And pools should be properly seeded anyway so "lucky brackets" don't happen. That's not a tournament format issue.
- It increases the chance that top players will meet in grand finals, since top players may have to be beaten three or more times to be knocked out. And if top players are more likely to meet in grand finals, guess what else is more likely?
I'm not saying the round robin into double elim format is bad. As I said, Smash majors use that format all the time, mostly because for the longest time, their majors consisted of only one game. (Now that there's Smash 4 as well as Project M, they may reconsider how they run tournaments due to time constraints, but that remains to be seen.) The format is nice in that it allows players more chances if they screw up, so an early loss is not as bad as it is in traditional double elim. It's certainly faster than true round robin, because there's fewer matches. And it lets the scrubs play more matches than they ordinarily would. However, it doesn't do all the things that you say at all.