Game is really lacking item diversity.
Riot really needs to work on bringing MORE items to league instead of just removing them. There frankly are so limiting choices to items that every role pretty much gets the same items every game. Whenever I used to play this game there were tons of aura items for supports and there was decent itemization for bruisers and tanks. It seems like now we are having mr and health being cookiecut, armor being a wasted stat, alot of cdr ad itemization, craploads of on hit items, and ap items being removed or intensively reworked, and none of the old items being buffed or reworked.
Fill Itemization gaps: resistance movespeed item, tenacity ap item, health regen ap item, regen armor item, armor ad item, as armor item, as health item, another branch for phage, grievous wound ad item, grievous wound resistance item, hyrbrid penetration item, counter cdr item, cdr aura, mana regen aura, armor aura, physical damage reduction item(anti ad caster), %health increase item, sight stone upgrades ap/ad/mr/ar/cdr/ms, max cdr increase item, crit ap, mana mr item, enchantments that effect heal, barrier, and cleanse.
The best way to do this is to just start making early item combos and seeing how they work out, alot of champions can benefit from long sword + cloth armor early game or Tomb + Bead just so they can get some offensive and defensive stats. So far the game forces you either to tank or to deal damage and gives you very limited options to do both which has caused the polarization of tanks being unviable and having to be buffed every season and damage dealers having to be constantly nerfed.
TLDR: There are LESS items now than when I first started playing this game and I feel like that's a bad thing I miss Force of Nature, Atmas Impaler, Madrid's Bloodrazor, Runic Bulwark, and Soul Shroud.