It works for all Symbols for me. I use it for equity symbols (shares) and Indices. It’s my workaround for the closure of “Yahoo Current”.
I can also use “Google Intraday” for intraday and End Of Day updates of Shares. The time taken to update (intraday) a list of Shares using “Google Intraday” and “Yahoo Historical” is about the same, so I don’t use “Google Intraday” because I don’t want an extra function in the overall mix (might as well stick with “Yahoo History”).
The main problem is speed. Using the defunct “Yahoo Current” to update End Of Day prices for 1500 or so Symbols was maybe 50 to 100 times faster than using “Yahoo History”.