Forcing multiplayer to experience content should never be a thing. Hopefully more new anti Thargoid weapons and such become available eventually to enable players to possibly solo these guys, at a minimum these "scout" Thargoids. I'm sure bigger and badder ones are coming yet, those can be the "multiplayer only" content.
- the thargoids being destroyed are 'cyclop variants' (and I think they are described as ?interceptors?). These currently seem to require a group to take down.
- a smaller thargoid, identified as a scout, has recently been found at a crash site and is about the size of an eagle. [ https://imgur.com/gallery/yZG7F ]
But it may be that future Thargoid 'interactions' include friendly ships - which might make things a bit easier.