There is "strategic adventage" to push caves, or atleast hold containers/entry points. Those IO's are vulnerable, the more you squeeze the benos, the less harassers will roam the Colony. You can then safely drag and intel back to LZ and then to Almayer.
The truth is: Not many benos, or marines think about "strategy", it all comes natural. If everything is smooth, no CO order will prevent majority of marines from trying to cut deep into the caves, if beno commence massacre, then they will naturally hump the cades. Who listens to CO after deploying? SLs have to, but rest of ungas can still push so CO will be forced to change his orders. Only on ICE most marines will back off from underground if ordered so, because they know it's suicide from the moment the map was choosed round before.
Also: You won't get Nuke on any other map than LZ if you aren't already winning with 5 benos and no ancient T3's left to kill. Rounds where nuke was deployed without admeme intervention on those maps are shrouded in fog of legends and myths.
Each non-LV round you have to push the "caves" (with Underground being ICE caves). Otherwise you won't get that sweet, sweet major.
As much as I would think it would be cool to have guys who scheme complex "strategies" of how to get Major for their team, nobody does that.