I’m a big fan of a mixed set of blades and cavity backs. I go 7,8,9,W in a pure MB and everything longer is going to be a cavity back.
The benefit of the blades for any player is the ease of getting the ball up out of the rough and having zero fear of ball that is sitting down in the fairway. Ball launches higher and comes down softer. Also gives you the opportunity to work the ball. As someone that hits it a long ways off the tee but can spray it, the ability to work the ball easily with the higher lofted clubs is key.
Personally, I don’t see much if any need to have bladed irons longer than 7 iron. When we start talking percentages, the farther the club goes on a good strike, the more punishment you will get from a mishit. I’d guess a mishit on a blade leads to a 15% drop off in distance. If your 6 iron goes 190 yards on a good strike, you will come up 29 yards short of that with a mishit - really no chance of hitting the green. On the flip side, if a good strike with an 8-iron goes 155 yards, your mishit will come up 23 yards short - still short, but a less so then the 6-iron. Additionally, the likelihood of a mishit with a 6-iron is significantly higher than a 7 or 8 iron. Might as well get the help where you can.