I bolted a scalloped neck to one of my Strats during COVID.
Yes, a light touch is what's needed, otherwise sharpie will be looking for you. You can definitely improve your speed, but it felt like I was shivering over the fingerboard rather than playing it. I pulled off that neck and it's in storage.
My verdict: they're not good nor bad, they're just kinda there - but nothing remarkable, no eureka moment.