: Literally half as effective in both healing and damage reduction if you're ranged.
: Not if you build an Eye to save a slot. My example for Karma should've been an Eye.
: I already said every support builds this.
: It's so bad, if you ignore Bloodrazor Enchantment as a stand-alone, the item is literally in the bottom 10 of least unpopular items, and its limited use still barely nets it a 52% winrate rounded up. The fact that its split pushing power scales on %max hp, this item does NOT give hp, and squishy supports do not build any significant amount of hp means this item's utility is relegated to its Point Runner passive, which is only good on splitpushers.
Most pure tank itemization provides nothing but resistances, and those which do provide utility of some kind are also packed with cdr, so you will be wasting gold in cdr stats.
Like your ADC, you should not be in the front line tanking damage. Sure 1 Tank item is fine, but that tank item will be
95% of the time because the rest of your build looks something like this:
[Insert non-cdr mage item here]
Athene's as a support item fails because it has 20% cdr. Consider that your support item will build into 10%, Redemption is a mandatory 10%, building Athene's 20% locks you out of the BETTER utility brought by other items because they have less cdr as stand-alone items.
The cdr in support itemization needs to be redistributed differently. Putting it on every item limits the actual non-cdr options a support might want to build because of the necessity of cdr as a stat.
The problem here is that there's no easy way to deal with this. If you shove all the cdr into two items (e.g. Support item and Ruby being 40% cdr) and take it out of all other support itemization, then it all has to compete with non-cdr high AP items.
If you just put 5-10% on everything you want to be for utility/poke supports, then everything has to be rebalanced to be competitive enough for item slots, which might make it competitive for mages as well.
The fact of the matter is supports need to scale better in ways besides AP before support itemization can be both GOOD and UNIQUE to supports. And until that happens, cdr is gonna be in a garbage state.