are there less informations from 229 to 280? it's strange because isn't this the timeline where Chen Shou is alive and active?
Not at all. There is plenty of information about that period. It just tends to get ignored because it's largely glossed over in fictionalizations of the period and most of the discussion and perception of the era is still influenced primarily through that lens.
I can assume that Chen Shou is to blame since he was THE chronicler, but a Shu affiliate.

















