NOOOOOOO STINKEEEEEEEE (Its politics are even more relevant today. One of the greatest movie murder mysteries of all time in how it simultaneously flouts whodunnit conventions and adheres to them.
Rian Johnson also knows that doing an Agatha Christie pastiche means the detective probably doesn’t have a dramatic emotional arc or undergo change ((CAN YOU HEAR ME, KENNETH BRANAUGH!!! I’M TALKING TO YOU!!!!!!!!!)). The detective is a tool to guide us; they are the needle, we are the thread, and the suspects are the cloth - they are the ones who change.)