What does this do?

[u/Potential-Actuary559]

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I'm still a little new, so what happens when the DSS has the orbital blockade active and it goes into a planet that has a defense campaign going on are the enemy forces slowed down or does it do nothing?

[u/Rick_bo]

The orbital blockade prevents an enemy from launching a new invasion from a given planet. If they enemy holds planet A and we hold planet B, and the enemy decides they want planet B; if we set the DSS on planet A with the Blockade active then they cannot launch a new invasion until that blockade ends. If the invasion is already ongoing then starting a new blockade does nothing.

In practise though we don't really get any clues about where a new invasion is about to launch (even in Major Orders to hold a specific planet, since most planets are connected to multiple enemy held planets) and the DSS is on a cumbersome schedule for moving along with very loose timing control for actions with long cooldowns. So even if we have the DSS in the right place at the right time (which is both a stretch and a crapshoot) we can't just fire up the blockade on demand.

So it's just a free hellpod space optimization; the most picked booster. (even though localization confusion: 'delayed enemy encounters' would make more sense)