Combine making it so that regular weapons can do some anti-xeno damage (obviously less than the dedicated weapons) with making Thargoids an actual aggressive threat that isn't 100% opt-in.
So danger level and tension is increased, but you've also got the ability to deal with attacks without needing to re-outfit your entire ship. And now fighting Thargoids gets integrated with the rest of the game, rather than being its own walled-off theme park.
It's even reasonably lore-friendly: the anti-xeno tech has been out for a while, so it's not crazy to think that mainstream weapons manufacturers would include some basic level of it by now.
But... but you can do damage to scouts with normal weapons...