Originally Posted by Kapusta

Uh, no.

Head angle and trail are PART of what makes up .how a bike handles.

Handling is an interactive process and setup of bars and stem affect how your inputs are translated into bike lean and steering orientation. It also affect the feedback you get from the bike.

If the handing SEEMS twitchy or slow, die to stem and bar changes, then it IS twitchy or slow.

You seem to be wanting to re-define what handling means.

To talk about “handling“ without talking about how the bike interacts with the rider who is doing the handling is utterly pointless.