--- Again, SPOILERS ---
You should really go back and do the other path. The Meera ending is seriously super bleak in comparison, and I was kinda upset by it too.
But the whole point of the Other is to make sapiens doubt themselves, and the Parents. When you go back you can guess, which characters are influenced by the Other. It even says that it's "always watching, willing you to die." It exposes some real flaws of the Parents, but in the end I wouldn't trust an entity that from the start tried to break Marco with doubt and terrifying visions.
Plus, Marco immediately forgets it, but we know how the amalgamation looks like and we know that "Meera" is lying about it.