Ban an item?

For a long while there's been talk of upping the 3 bans per side to 4 or even 5. main problem here has been that it can result in banning out a persons entire champion pool, particularly in competitive play. So what about a different approach, hitting not champions but a single item per team that you do not want to play against?

Playing poke => ban out warmogs. What about hard engage comps? ban out mikhaels or Banshee's. Just think Sated devourer is too strong? Out with it.

There are two benefits to this approach; first it's broader, meaning you cant target ban someone, his way, and it also relieves way more from your chosen comp than a champion ban approach. if j4 is banned you can always pick Vi for engage right?

The other benefit is that it shows a very clear direction in champ select, so sure you diminish the strength of certain comps, but you also show your hand, and allow enemies to predict what kind of champs you will play, and plan against that.