Isn’t the global timeline supposed to show just the posts from the instances your home instance federates with? There are many (relatively-small, usually, but also larger ones) instances that federate just with servers that are known to host good content, in these cases the federated timeline is a great feature. Similarly, here on Lemmy, the federated frontpage contains good content and is not a bottomless pit of bots/spam/cryptonews like mastodon.social’s federated timeline. Not sure if you’re advocating for its disabling just in mastodon.social 🤔