The A vs FMJ spindle issue has been rehashed here repeatedly.

It boils down to preference really. The quote you provide was an incorrect, off the cuff comment that had zero facts to back it up.

If you want numbers and facts

https://www.bigblockdart.com/techpages/spindles.shtml

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.