Yes you get vacuum when you lift or operate at part throttle... when you are at a “track day” event you may not be off the throttle long enough to build vacuum especially with a supercharged engine. If you are “two pedaling” the car (never letting off the gas and just using the brakes to settle the chassis entering a corner) you will not have vacuum.. or to put it into a “street” scenario ,, you’re charging up a mountain road where you never let off the gas and are in a positive boost scenario..
It’s been some time since I had a vehicle that preformed the way I wanted running “full throttle”.
Two peddling is a given since you need to maintain RPMS while setting or shifting weight for cornering.
I’ve always used my left foot for braking and have no idea why kids are taught “not” to use their left foot.
There have been soo many cases where people thought they where stomping on the “Brake” when in fact they where on the gas. Sudden acceleration syndrome, it nearly bankrupted Audi and Toyota more recently.
Sadly, most people don’t understand “how” an automatic transmission works. There is that little thing called “Stall speed”.
At the end of the day I wish that automakers would move away from the complexity they have engineered into everything and get back to a few basics. It seems to me that they do this as to keep control over both maintenance and repair.
As a guy who designed automatics for 25 years, I can say we rejoiced the day the engine guys let us into that software system that controlled the engine and we implemented "torque management".