#402434
I think Dizzle does bring up a good point - there's a solid bit of player interaction that is made untenable due to the OTF rule, namely assimilating your opponent's counterpart and then assimilating his homeworld.
The go-to strategy is to stock your own counterpart and your own homeworld. When your opponent ends up playing an affiliation that you plan on targeting anyway, there's little incentive to use his personnel as the basis of your counterpart/homeworld strategy, rather than the stock counterpart you were going to use anyhow - and that contributes to the feeling of Star Trek CCG solitaire, when the Borg are specifically designed to be a player-interactive affiliation.
It would be cool if the OTF rules brought an errata to Assimilate Homeworld with it. Perhaps:
"Plays on table. Target both an unassimilated homeworld on spaceline and your matching counterpart. Your Borg may scout that homeworld (including opponent's, if your counterpart was assimilated). If your counterpart is at that spaceline location, you may probe"
I think the additional requirement of having to grab your counterpart from your opponent makes the mission-stealing difficult enough to prevent it from being abusive. (And if you want to do it the old-fashioned way, you still could).