Because if you start bringing up stuff non-mafia-related, it becomes angle-shooting. For example, using someone's online status to say that they're avoiding the thread. Angle-shooting is not allowed.
D1 is not useless in the slightest. It's by far the most useful day phase of them all. It will create a foundation for you to propel yourself with going into N1 and the later day phases. Having a strong day 1 is important. I can't go in-depth without making a big post which I'd like to avoid but just remember that day 1 only sucks if you make it suck. If you doing stuff on D1 and making things happen, you will be rewarded for the rest of the game. Always do shit D1. That's the mentality you need to have to be successful and win games as town.
It's only annoying to the players who let themselves get caught by it. Meta is a perfectly valid scum hunting technique to use in the game. History matters. As a real-life example, investors like to measure the performance history of a mutual fund to determine how well it's gonna do in the future. If the past performance shows that during a bad market year they minimized losses then you can know that in the future, if there's another down year, you won't lose a lot of money in that fund as other competitors would have. If during a booming year, the fund was able to outperform its category and even the market during that year(s), then you know that if there's another boom, your returns are gonna be great. Of course, this isn't perfectly accurate 100% of the time but it's a good way to judge how good a fund is.
The same logic applies to mafia. You use a player's past performance to determine if their current performance is scum or town indicative. It's not 100% accurate and meta should never be the primary reason why someone is one alignment(unless it's so damning and apparent), but there's nothing wrong to using it as a supplementary reason to the rest of your case. If you're unhappy about meta then make sure you don't a meta. Make sure you can play the same way each game no matter what the alignment so players can't use your game history against you.