It's built-in, fast, and works for what I need. Which is mostly skimming newsletters and then deleting them. When I need a more featured alternative to somethi

It's built-in, fast, and works for what I need. Which is mostly skimming newsletters and then deleting them. When I need a more featured alternative to something I'll use one (Things instead of Reminders, OneNote instead of Notes, VLC instead of QuickTime, etc) but email hasn't been one of those things. Is there a reason that I should be looking at Mail alternatives? What important features is it lacking?