I fear the discussion is headed down a rabbit hole but as a point of order I think the reference was to trim in roll (aileron and/or spoiler trim)…
FWIW I spent umpteen years flying around (gliders, fast pointy things, bigger things, some with FBW) and like you say in your OP I don’t recall ever having to consciously nudge or remind myself to apply out of turn spoiler/aileron…I don’t deny the aerodynamics theory behind this but I suspect like many I just (tried) to waggle the controls around to achieve the desired attitude/result…
Last edited by wiggy; 26th Oct 2021 at 08:01.