Well yeah, with a Golem along for the ride I think you could probably set them to group move back to the home planet and then just go make a sandwich.
I kind of wish I'd turned on hard Golems and Spirecraft for my FS game. The AI's going to send exo-galactic strike forces anyway with or without them. Something to remember for next time...
Depends on the difficulty, like everything else. For my second shard retrieval on 8.3 I got hit with tech IV and V units. Even the mighty DPS of the armored golem simply couldn't churn out enough damage to stop the waves. In desperation, I starting lobbing EMP warheads to at least stun the enemies, but generally I had to burn one every 20 seconds to stop the next wave of incoming enemies. As a whole, it was a frustrating ideal because I simply could not find ways to deal with the waves. I felt a rare time in AI war were I felt there was "no other option". Choices that I felt "denied" included:
Give the shard extra speed (logistical station)
Give the shard extra HP (through group moved shield generators)
Repair the shard during lulls in waves
Any other way of using the shard other then a slow crawl to the homeworld
The shard repairs would really, REALLY make a difference for me at least. If halfway during a chase I could have the shard crawl under the temporary protection of multiple shields so I could repair it I feel there would at least be a fighting chance.
Also, remember that if you enable multiple scripted event wave options you really, REALLY, have to manage your economy well. Golems and Spirecraft give you more options, but they give you no more resources or energy to be able to use them. Plus those extra exo groups really hurt and tie up your forces, further killing your economy. I had to end my last game because I had all three at once and could not use all my options but I was being hit as if I was able to.