What if there was an automatic ping
Whenever an enemy goes from MIA to somewhere in your vision. So when they walk over a ward it pings everyone, if your jungler spots someone it pings it. It could be annoying in cases where someone is walking in and out vision, but you could add a timer so it could only do it every 5 seconds or something.
Most people suck at this game, myself included and I miss stuff on my mini map all the time. I'm silver 2 so I know everyone below me does too, and I was Gold last season and it was the same.