Vanguard's Admiral share mutual funds almost never differ in cost from their ETFs.
As for it only "technically" being a mutual fund: consider that VFIAX predates VOO by 10 years. How does that square with VFIAX only "technically" being a mutual fund, when presumably it was a real, honest mutual fund in the years 2000-2010 (before VOO was introduced)
As for it only "technically" being a mutual fund: consider that VFIAX predates VOO by 10 years. How does that square with VFIAX only "technically" being a mutual fund, when presumably it was a real, honest mutual fund in the years 2000-2010 (before VOO was introduced)