Why is Sightstone a mandatory item? My problem with the support role.

I know people will hate me for asking this but it is an honest question. It is not particularly fun having to buy this item with subpar stats, especially when players overestimate its power. Locket of the Iron Solari was just modified because it was viewed as a universal item that at least one player on any team should have. So my question is why do we still allow sightstone to be viewed under this light? Why is sightstone not being looked at for being a mandatory item while locket is? Surely there are more ways to freshen up the vision game then just saying here is one item that you must but every time. There should be more fun in the choice of how we want to provide vision similar to how junglers get a variety of different jungle smite items (yes, I know there are different variations to sightstone but to be honest they all feel bland and exactly the same).

Sightstone in its current state just feels bad to buy.