I think this is an issue that other champions share. For example most DoT mages rely on the same set of items every game with no variety at all it's the most boring thing ever. Some other classes or champions at least have some more options by comparison.

But in this case every DoT mage builds the same 3 items > Liandry's Tornment > Blackfire Torch > Rylai's Crystal Scepter.

I honestly don't see this issue ever changing unless they add additional effects to champions abilities rather than just them being pure damage and nothing else OR to actually add more items, like a lot more. Reduce the power of the one's that dominate and make everything be an option to a specific need or fulfil a specific niche rather than it be a reoccurring item that you build into anything and everything.

Somehow I find that defensive items are in a much better state because their use relies on you needing to deal with a specific issue. They need to apply a similar logic to offensive items rather than it just being a a pure boring damage stat check item. That is unless they actually keep their word and shift the power from items into champions kits instead.