you'll find in the sub-$1000 laptop range you'll get something that is literally twice as fast
That's true, but it would require some combination of major compromises on the SSD, RAM, hot swappable battery, build quality, form factor, and keyboard/trackpoint. I'm almost never CPU limited in my day to day workflows, even on a 2nd gen i5, and I have cloud resources available when I need to do something CPU intensive like model training for work. It's a tradeoff that isn't right for everyone, but those other factors are far more important to me than the CPU.