ive had positive displacement cars: 03 lighthing/ Tork Tech kit on my car.
I have also owned two 3.5 ecoboosts... neither had ANY lag. One had 3.73s and the other has 3.55s
The whole point of twins is to reduce/eliminate lag.
Hell, my current setup on my mustang barely has any noticeable lag
Try not to take this the wrong way, but If you aren't feeling turbo lag in an Ecoboost F150, then I have to question whether or not you actually recognize what it is? I've driven MANY Ecoboost F150's and they've all got measurable amounts of it, that is easily felt. They're virtually a dead pedal until they spool up.....then they hit like a hammer. You can feel it from a dead stop when you have to roll it out a truck to a truck and half length before it comes on and also when attempting to pass. As a matter of fact, I drove the 5.0L TiVCT and Ecoboost F150's quite literally back to back and the 5.0L, while not as powerful, was far more responsive on the throttle. Stab the 5.0L to the floor from a stop, or on the highway, it takes right off. Do the same with the Ecoboost and you can literally get to the end of a "one....two" count before the turbo's build enough manifold pressure to lay it down......then its REALLY takes right off!
Blowers on the other hand, have ZERO lag (even centrifugal's). That's something that can't be claimed with a turbo setup, no matter who designed it. It's just the nature of the beast. The turbo no matter how small, or how well engineered is ALWAYS a restriction in the system until the exhaust can spool up with enough force to overcome it.
The PD blowers start making power almost instantly. From a dead punch, I used to start seeing boost at about 900RPM with my old Eaton and was seeing 90% by about 2,300RPM....and it was only pulleyed for about 9-10psi. Throttle response was literally instant. That's why people compare positive displacement charged cars, to big block swaps. The power, (much like a big cube engine) is quite literally "on demand" at the flick of your right foot.
On the other hand, the best engineered turbo set ups out there don't even start making boost by that RPM....let alone max it out.
There's no arguing that max available power will be achieved with the turbo....but drivability still goes to the blower.