Honestly none of this would be an issue if Riot would just suck it up and give a proper tutorial, given all the aspects of this game you don't actually learn about unless someone else tells you.
There should be an extended tutorial for basic stuff, similar to the current one (not that b.s. with the game telling you to build Ashe with Thornmail, but the "battle" tutorial.).
Should be some things telling you about trinkets, which there is nothing of, telling you about bush vision better, making you place a ward for example, or some little mini tutorial saying "buy the warding trinket - now place it is" then something like "the enemy has placed a ward in x bush. Sweep the bush and kill the ward", in that female announcer voice.
There is plenty they should do, and these tutorials would teach new players this stuff and help reinforce it for others. As it is now people just do whatever and try to copy the pros in the most awkward and ass backwards ways, and end up doing none of it correctly, or at all, because they don't know why people do it.