Question about HGW / HWGW and their effects

I wonder why is it HGW or HWGW and not e.g. HHHWGW or HHWWGWW.

What I am saying, (I assume) the effect of hack, grow and weaken can be calculated on a certain server with certain parameters. Does it really always boil down to HWGW being the most effective thing to do?

E.g. as an oversimplified example if Hack would bring up the server security by 2 and Weaken brings the security down by 1 it would make sense to execute Weaken twice after Hack.