I know what you’re getting at and it’s correct – but (and this is a good geek-out mental 3D topic thread, apologies to the OP for the diversion..) .. to corner any bike would need some lean, and as soon as you lean that 90 deg HTA and negative long offset fork you’d have forces on steering creating what I think would be effectively very similar to ‘flop’, a force turning the bar into the corner direction (but..yeah, sort of irrelevant..)
Agreed, I was only using this extreme example to demonstrate how trail and head angle differ in terms of their effect on camber change with steering lock. The simplistic way of looking at it is to think of “trail” as providing the steering weight/feel (zero trail would give extremely light steering with no feel) and head angle as providing the stability (slacker head angle more stable). In practice they work together, so if you want maximum stability and a damped steering feel then a slack HA + high trail is the way to go. A shorter fork offset is one way of achieving this aim, especially if you don’t want to go overly slack. If you want a more agile responsive setup, then steeper HA and less trail is required.
There is no right or wrong approach as long as it suits the rider and terrain. My local singletrack (Woburn) is super tight and twisty and fairly technical in parts, though there are few steep descents or high speed sections. So stability is never an issue on a modern trail bike. This terrain suits more agile and compact (basically less fashionable) geometry best.
