So as a support main... I'm completely fine with the support item changes.
I like them. Literally the only valid complaint about them that I've seen is that they Relics don't provide a lot of tankiness.
Which tbh, is balanced by the fact the spell thiefs lost their sustain as well, but I can understand why supps like Leona or Naut could be miffed by it.
I'm REALLY glad Coin is gone. That was the most bs supp item imho. Though the movement speed niche was nice, the fact you got the gold for literally just existing in lane- no last hitting or hitting spells- made it a toxic item in the role. We still have a lot of time before we can make final judgements and they haven't been out that long. But overall the items feel satisfying to use. They obviously still need to be fine tuned, but they work well. Forcing champs like Sona and Janna to interact with the lane and not be overbearing due to sustain.