[Chrislong]

There are different types of flex. Here is my opinion - may be wrong, its from my experience.

Alloy flex's differently to CF/Composite type materials. For example CF flex's and springs back like a tight spring, and with an too flexible CF chassis this will make the car grip roll violently! I experienced this with the Academy SB-Sport.

Alloy flex's more lazy and this flex can translate into a more forgiving and high grip feeling (but only if not excessive).

And then plastics are different again, a bit more like alloy than CF, but you can't have too much flex as then it risks becoming fragile. Going to a carbon composite like factory team B4 chassis just reduces flex whilst becoming lighter over plastic.

Personally, if plastic or alloy flex is good to a point - not excessive. If CF or a woven material like Schumacher S1, then id aim for stiffer than flex, to avoid the unpredictable grip roll on high grip tracks.