Huh? Shouldnt that actually help with the problem you're describing?

By giving you the option to save the action for later, you're under less preasure to use it right the second it comes off cooldown again - you can still do that, but if the skill doesnt fit in your rotation right now, you dont lose anything if you wait an additional 10 seconds.
This system is actually helping you with not having to press everything right in time and instead giving you some leeway.