No, actually I believe a softer break is better than a harder break. However, I also beleive most people believe the opposite. That is why I mentioned what I did. Yes, popping the cb will lose energy to the rack. To those that think you need as much power as possible, that is a bad thing, and counter-productive.
"Science" has shown that a harder break will not give a better spread, and will tie up balls more often. So, a softer break is more beneficial.
Popping the cb does nothing to benefit the break. The cb does not squat because of it popping up in the air, it stops because of where you hit it. One can just as easily pop it up a foot or two and then have it shoot forward. As far as it gettting the cb out of the way of rebounding balls, you will find that over time it is a wash. Sometimes it will, sometimes it won't. Same as not popping it.
Popping the cb up does nothing more than give you a better chance of going off the table with a less than solid hit on the one. Doesn't make it any easier to squat the cb either, that is strictly a matter of where you hit the cb. The cb doesn't lose much spin at all while in the air, so any spin you had on it when it went airborne will still be on it when it lands.
When you pop the cb, to get the results you want out of the rack at a given speed, you have to increase that speed a little. Much easier to just hit with as level a stroke as possible and hit at the speed you determined you needed. Hit properly, the cb will squat after the initial rebound from the rack. Just takes a little bit of follow on the cb to squat it. Much more accurate staying down and using a "normal" stroke on the break than jacking up the back of your cue or jumping up in the air thinking that adds something when it doesn't.