What I took from the OP question was this scenario:
The apocalypse comes....no power, no knife suppliers, coal/charcoal forges, hand powered tools. What single steel would get you through the hard times ahead? .....1084 ( or any simple steel from 1070 to 1095/W2) would be what I wanted a BIG pile of in the back of the forge. It will make any tool, weapon, crossbow, hunting device, bear trap, etc......you will need. It would also be readily available and affordable in large supply.
All stainless steels would be useless. ( and just for the record, mankind did very well with nothing but carbon steel for about 3000 years)
Most high allow steels would be useless or difficult to work and HT.
If I was going to stock up with something I could work into knives and tools, it would be 1084.
A single super steel knife made before the apocalypse may soon be worn out, broken, or lost/stolen.........what would you do then? What if the Zombie slayer you made does not cut firewood very well...or screw in screws...or spear a pig....or slice up the pig....etc.?