I'm an ETF portfolio manager AMA

I've been working as an Index Portfolio Manager for the last 15 years for two of the major global investment management houses (which will remain unnamed). I appreciate I can offer no evidence of my experience but I really do not want to get fired, social media engagement policies are very strict I'm afraid.

I will answer any questions covering how ETFs work, the role of index PMs, etc. I read a lot of confidently incorrect statements in these threads.

I will not answer 'active' allocation questions or provide outright investment advice.

EDIT thanks for all the questions, i've answered more than 100 i think, i'm closing this here as it's a bit overwhelming, maybe I'll do another AMA in future, best of luck everyone :-)