If you watch more carefully .... you will notice that at least 50-60% of today pro's are using Players Cavity Back irons.
I used to play Wilson Staff Fluid feel about 25 years ago, at that time I used to hit at least 300+ balls per day and spended hour after hour on pitching, chipping, putting etc.... I went to single figure within a few months, but you just have to enjoy working hard to really control blades.
After using a lot of SGI and GI sets, even with very low offset like in the TM Tour Preferred iron, I was about to go back to blades, I tried several, but my swing isn't like 25 years ago, a slightly more forgiviness is nice ...... I ended up at the Wilson Staff FG Tour (yesssss I have always been a Wilson Guy), they look to have a big cavity, but they play like a (musscle back) blade set ...... you just have to nail them at the sweetspot, but if you don't you still end up quite well.
It will help you becoming a better ball striker if you chose for blades, you'll just simply have to, but I doubt the punishment you will receive on off center hits, will allow you to lower your handicap much ...... maybe it is a nice thought to pick up blades 8-LW and some cavity backs in 3-7 ....