Its not imho the spawn rates that's the issue its there being stuff that is genuinely new (to the player, and non-codex) and findable.
So how would you make enough "genuinely new" content to satisfy 100,000 (1) players all combing the galaxy? It's "genuinely new" for what, a week after a release introducing it?
The development team is tiny compared to the playerbase. No matter how much new content the devs put out there, it'll be consumed MUCH faster than it can be produced. Production takes MUCH more effort than consumption.
Nevermind that exploration, while very popular, is not the main thrust of the game. The main thrust is the Bubble and the activities that happen in that, so the DevTeam also has to satisfy those players with new content.
Expecting them to come up with genuinely new content to satisfy everybody is ludicrous. Even NMS, whose entire raison'd'etre was procedurally-generated lifeforms gets criticised for being too samey, and they spent *years and years* on their procgen. There's really only so much you can do. Either make it so rare, that it really will take a long time to find in which case people will whinge and moan and complain about never finding anything, or make it less rare and have people whinge and moan and complain that it's everywhere and all the same.
Could it be better than what it is? For sure - but will it ever be "good enough"? Doubtful.
If you have -concrete- suggestions in how to solve this, I'm sure the DevTeam would love to hear them.
1) I have no idea how big the currently active playerbase is..