We don't. You misinterpret that, greatly.
I'll say one thing though, before anything else. The game should be more intuitive on where you unlock some stuff. Not everything in the game is unlocked through one obvious blue quest, though it's rare. And those instances are indeed scattered. I'd rather that information be made far more plain and easy to access in-game to cut down on the need to google things.
That said. Information isn't exactly hidden from you, and for the most part of the content, things are brightly visible to you. It's all a matter of time. Sprouts have a lot of content to go through, that much is true. But they're playing an MMO, there's so much more to do outside the MSQ. And while it can feel overwhelming, it's a necessary evil. They'd be overwhelmed with an in-game list of what to do and where to find it anyway. You can also make the argument that "oh, well, not everything needs to be unlocked anyway", which I only very partly subscribe to, and it doesn't exactly improve on the matter when it comes to accessibility when people actually want to do it. But it's a thought. Because some stuff can very well be skipped.
I doubt new players are that helpless. And it's eventually a matter of time, patience and research, as there's quite a lot of information outside the game that is readily-availble thanks to fan effort. Google, again, exists. For better and for worse.
So it's less so "lmao new players fend for yourselves". It's just that there's no real other way to approach the subject without going overboard on the way the game's designed. And I'd rather not open that particular can of worms... So what we have will have to suffice, and thankfully, there are players out there who were gracious enough to make that information organized and available to look up. Past that, it's up to the sprout's discernment. Some people in-game can help, and at least the necessary stuff is marked rather visibly in not too inconspicuous locations.