ETF tracking World Value Small cap stocks?

@xorfish

Hello I found this document:

https://www.prospectusdocs.com/eol/request?PAGE=DISPLAYPAGE&cid=963917&s=025072802&prid=000821006236

Apparently there is a mutual fund version of the AVDV with the “G Class” that is available for retail investors. That MF has an expense ratio of 0% instead of 0,36%. Is there a reason for us not to buy that version ?

Though I could not find anything with the ticker AVANX in IB. The prospectus does say in the end

G Class shares are available for purchase only by funds advised by American Century Investments and other American Century advisory clients that are subject to a contractual fee for investment management services,

which means we probably do not have access ?