For those struggling to down a Thargoid; I think I read somewhere that they don't use thargon swarm if in orbit/planetside so try the near-surface encounters if you struggling.
#Edit ; or add me in game and will try help out when on ( not that regular but I'm floating around most weekends atm )
Does destroying a Thargoid on planet surface spawn hearts for scooping? If they don't spawn swarms, what else do you have to watch out for apart from the lightning attacks after a heart is destroyed?