We need another AP CDR Item

With the new masteries (45% CDR) cap not everyone can reach the CDR Cap efficiently.

The CDR Items for AP users are as follows:

And but that's not really limited to AP.

Those aren't good on everyone, sure they work on Vladimir, Diana and Ekko.. but what about the others?

Are more supportive items, i don't think you'll see a mage building this.

Leaving you with / + = 30% CDR. 35% with the mastery

My point: Mages that don't benefit from can't reach the cap the cap efficiently unless they use runes

TL;DR mages like can't get 45% CDR unless:

1. They build a inefficient item
2. They build both Athene's and Morellonomicon
3. Sacrafice magic resist for CDR runes

Why do mages that don't have inbuild CDR (zyra, ryze) need to spend a decent amount of IP on runes, and maybe even a new rune page purely to reach the CDR cap without building inefficiently?

UPDATE

{quoted}

Max CDR should be optional. You can't have full offensive stats and %45 CDR in same time. You shouldn't have.

Which is why need another item with CDR. A new one. Staff of Flowing waters, or something else.

AP Mages: highest possible CDR item: 20%. need to sacrafice MR Pen boots and MR Resist glyphs to get 45% CDR efficiently.

ADCs: highest possible CDR item: 30%. now build deaths dance or triforce (both are good atm) and you have 45% CDR. no boots sacraficement, no glyph sacrafices.

Why are people that rely so heavily on spell casting, getting less CDR than those who can easily kill people with AA's?