From a practical perspective, you don't need to fly away. Just get your SRV somewhere safe (don't bother shooting any of the last sentinel spawn), exit to menu & start again.Also, it would be great to have a Guardian blueprint source for which I don't have to do the same stuff 20 times with flying away and relogging in-between. This I consider a chore, and that's coming from someone who actually liked the Engineers in their previous, original iteration.
But, yeah, having to do exactly the same thing even twice is a design fail.
To be fair, there have been some pretty horrible release messes ever since ED went live and the recent SNAFUs aren't as bad as classics like the "stop exploring" fiasco...Can we please swap Sandro with Michael Brookes?