Has he gained any of that acceleration? If not, then I’d say it’s a definite nope. If he has, then you’d have to look at the trade offs and maybe give it a little more time. Trying new things is great, but there have to be advantages to switching. If there’s nothing gained, then there’s no reason to switch.
There are a lot of ways to get that extra acceleration. Try a different profile, or different type of profile - triple, center glide, quad, ellipse. Dial the +2 back to a +1 and see if that gives him the middle ground. Try a shallower hollow to reduce drag. Try a different type of steel, like Flare or Bladetech. Getting the right profile can make a huge difference in someone’s skating. But finding that profile takes a lot of trying different things to see what works and doesn’t. My suggestion is to take all his old steel and have it profiled different ways. Then try it all out and see what sticks. If he doesn’t have a lot of old steel, find some cheap used sets on SidelineSwap.
I just went through the same thing myself. I tried and tried to get input from different people here to avoid the trial and error portion. In the end, I just had 3 old sets profiled differently and tried them all out. I’m glad I did because the one that felt best was an Ellipse and given reviews and input, I probably wouldn’t have picked that.