Low speed torque and driveability ?

273 said

I think improper torque converter is a big part, overlap and cruising rpm, throttle response, how it goes from regular driving to aggressive driving, I think even the power difference cause as you build more and more power, down low doesn't gain much and could even lose some making a big difference how you engine feels at low rpms compared to higher rpms.

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Exactly. If enough lown is lost, it just means the build needs to be setup to take advantage of where the new "low end" actually is.
A car that idles at 1500 probably won't cruise at 2k real well, LOL.
But with proper setup, no reason it couldn't go merrily down the highway at 3 or 4k. It's just our notion of what "high rpm" is and our tolerance for noise and vibration that make it off putting.