> Does it really matter if the spam quality gets better?

It matters a lot. Spam is easy to recognize and e.g. my current email client filters out dozens to hundreds of spam mails per day without any false positives. If you cannot distinguish spam from normal posts, this could even cause democracy to break. Unfortunately, there are strong anti-democratic forces in the world who want this to happen. In my humble opinion, this is the biggest threat to humanity right now because (unlike other threats) it's not hypothetical, it's going to happen.