Most people you run into playing league, are those who seem to fire off every ability on cd to maybe land them on the enemy.
They dont seem to understand that even "successful" uses of abilities are actually wasteful. Anub landing a stun or diving into a group for example. Except he did it while his team were not in position yet so the net sum was only the initial damage and an empty stun. He continues to spam his abilities every cd. An enemy escapes while his ability is on cd or because he is out of mana.
Chromie fires off her combo, missing a moving target but is on CD when the 35% health guldan is sucking HP out of the tank.
After having spoken to a friend I realize there are so few players in competitive who have ever thought of the concept of holding your shots, dps or utility, or with the option to be talented for additional functionality, to use it at the most oppurtune moment.
I witness this a lot when playing arthas with Cc up the wazoo. I try to wait for their ability timers and cc the enemy accordingly most of the time my dps seems too hyper focused on one unlikely target and ignore the easy kill i create for them or are too busy using their abilities on cd to realize the oppurtunity (them hitting the target i create at this point seems to depend on chance).
Even more confounding is something ive seen borh in ow and hots. People will out rihht ignore cced enemies and chase after free ones losing both.
There are tanks with peel who waste their abilities such that when the stealthy or diver goes for a vulnerable team mate they cant do jack. As dva i always save my Q and W for such an occassion if the enemy comp is built as such.
Randoms being randoms, I dont expect this to go away soon but to realize this concept is entirely to most players is confounding. I dont mean that in a snarky manner. Just esasperating that people who seem so very aware of the Meta, best comps and counters (macro decisions) are so utterly ignorant of the micro decisions that occur during actual gameplay.