Is the VVT-I underrated?

Which one?

VVTL-i is the goat valvetrain system.

Basic timing adjustments which are hydraulically actuated have been around since the early/mid 80s, its simple tech, its not even granular, just staged.

that would be the VVTL-I

I need a 2z in my MR2

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but it IS all the same shit. All the tech is is a system to alter the valves open/close timing. The only difference is HOW its done. The performance differences between systems is not enough to matter.

Nope, other systems also vary inlet length and or volume as well as valve lift and that's ignoring the fact that the system is an on off switch rather than a constantly varying system.

Depends on which engine.

1ZZ is an oil burning heap of shit, but the 2ZZ isn't too bad.

your over complicating the issue just to try to look smart (and failing).

en.wikipedia.org/wiki/Variable_valve_timing

it all does the same shit, just fucks with valve timing.

Nope

This and the actual real world delivery of power is much different as well

I’ve owned superlative examples of both technologies, and in multiple generations. Vvti is great. It’s much more passive and smoother. Vtec is more aggressive and abrupt. I feel it performs better at its peak. It is also far simpler in all aspects