Possible solution to deal with too much CDR: separate basic spell CDR from ultimate CDR

So the basic idea is to give DPS items basic spell CDR, while burst items more ultimate CDR.

Just for some examples, Sheen upgrades would give basic spell CDR, since that item promotes mixing autos and spells. Active items like Righteous Glory, or especially Zeke's Harbinger, would give ultimate CDR, since these items promote playing around long cooldown-high impact spells.

This also allows champions with long ultimate cooldowns but less impactful basic spells to feel better about getting early CDR (Shen for example, who rushes Sunfire Cape and Tiamat/Titanic Hydra for waveclear), but forces champions with strong skirmish capabilities to choose between getting lower basic spell CDR to increase their 1v1, or getting lower ultimate CDR to try to teamfight instead. It also opens up design space, and make it less punishing to not rush CDR.

We've already seen this idea being explored a little with runes like Ultimate Hat and Presence of Mind, so I'd like to see what people think of implementing this idea.