The point is that all bugs should be report to Apple. They don't release betas just so people can play with them for fun and talk about them on a third-party message board. They release betas to essentially get people to test their software and report any issues, particularly the ones that may affect any of the apps they've created. That's why the invitation to participate in testing betas goes out to Apple Developers and not the MacRumors forums user directory.
If nobody reports a bug, they're not going to fix it. They can't fix it if they don't know it's broken. As we've seen on these forums, the iOS 7 beta 5 is hit or miss for some users. If it's "hit" for half the users and none of the "miss" users report it, it's going to remain hit or miss.
If only a couple people report a bug like "my email isn't pushing" without any more details, they may write the bug off as an issue isolated to their email provider because they have nothing else to go by. Even if you think many people have already reported it, it's important for Apple to get a grasp on how many people it is affecting, and what devices they're using, etc., especially in cases like this where it isn't everyone who is seeing the issues.
People on these boards don't reply to threads like this with "Report it to Apple" just for poos and giggles, it's done so that the issues actually get fixed to give everybody a better experience with the device.
So, yeah, this is a discussion forum, and you're free to discuss it here, but there is also a proper channel for issues to go through if you want to make sure the issues are fixed when the final version out in September.
