Cooldowns seem too accessible.
There are a lot of items that give cooldowns these days; some of them even 20%. I used to use CD runes because it used to be nothing had 20% CD and if you wanted to reach that 40% you needed that little extra boost off of runes. Now you just need 2 items and done, 35~40%. There should be a tradeoff to how you build your champs. Do you want extra damage/ap or do you want faster skill resets. As a tank do you want more def/HP or do you also want faster skill resets. For me, I am a Skarner main and I no longer have to use CD runes whatsoever because I just make Frozen Heart and Triforce and I have my max CDR with just 2 items. Champs like Riven just need Black Cleaver and Lucid boots and already she has 35% on her first 2 items. CDR is just too high right now.
unless I'm playing a champion that uses mana and it's early enough in the game I care about my mana costs. % amour pen and mana becoming no consideration make them trash lategame imo.
. Atleast tanks can buy banner of command now(not that they couldnt before but it is a true tank item now) I've seen it said that tanks dont need to reach the cdr cap because "Tanks have low base cooldowns anyway", but a lot of tanks have impactful ultimates, and basically all their damage come from cooldowns. So you do want all the cdr you can get imo.