Oh no, from experience I'm still going to be white knuckling something, it's just not something that can drive us over the edge. The same largely applies to
flyovers & drawbridges.
The only arachnophobia person I know who saw it tore the armrest off the seat when she took us to see it years back in the theater & was practically rooting for the fire like a sports fan during the fire. Like me & my vertigo & my friend's cackling glee over doing horrible things
to clowns that relative is able to enjoy that catharsis of that fire. That's an important distinction for a horror checklist because many horror tropes
deliberately attempt to induce similar states of on edge unsettled in people
without even touching on phobias
You are going very deep into comparing apples & screwdrivers by comparing the vicarious thrill of something like someone torturing clowns in left4dead despite phobia someone with arachnophobia watching spiders burning in a movie of the same name, or even someone playing a character that is experiencing horrific things while seated at a table with friends also playing characters experiencing similar to a LARP where someone had to face a clown that may or may not have deliberately done something unsettling face to face with a clown phobic person.
I also think
the whole lines and veils things are poorly done & incomplete in ways that link back to the original "I don't care for that" vrs "emotionally harmful thing". They are poorly done because they are transparently drawn from the fetish community's soft limits hard limits & safe words while getting so much wrong. Like some of these safety tools, that community was using words like consent & aftercare with pretty serious well developed tones
long before the recent babysteps spotlight., That's a topic for a second post as it's a bit involved & the phobias discussion is probably a bit of a dead end.