I think its unwise to believe the batteries even leave the factory fully charged.
Full charge takes time, and time is money, and there is no honor in achieving maximum profit, and max profit is paramount in the world today..
The last pair of 6v costco interstates I installed new, the Specific gravity wold not rise where it should be until I cycled them to about 75% SOC, and then 14.7'd them for hours, then eq'd them.
They are still performing well for their owner a few years later. I EQ them once a year, and his Iota 45 amp converter does the rest.
I think EQ'ing new but self discharged unbroken in batteries, could be unnecessarily hard on the plates
I've read on Automotive forums, that interstate has moved many of their automotive starting batteries from JCI/Clarios, to Exide, as their manufacturer, and quality has tanked further.
No idea about their Marine batts, GC-2's, or GC-12's.