Proposed System Change (Repost)

[Aldarin]

To keep the same pace, the action use time needs to be made longer to achieve the same results as with stamina bar, except the stamina bar is a much clearer indication of the global cooldown and getting "you can not use this action at this time" spam would be annoying.

The "you can not use this action at this time" actually happens for some sets of abilities even with lots of stamina remaining. This is because ability use times are not proportionate to their stamina cost; some abilities are longer, others are shorter than expected. I have run into a number of situations where I have had stamina remaining and would have liked to use an ability, but couldn't due to waiting on the hidden universal cool-down.
I agree that a cool-down message would be highly annoying, but there are other ways to institute an indication of the global cool-down timer.

Removal of the stamina system
Any game needs a timer for ability balance. However there is already a universal cool down associated with abilities, the second universal cool down is unnecessary and adds to the amount players need to keep tract of. As of now it seems to serve no useful purpose and adds annoyance to many players.

Only having one universal cool-down timer also makes it easier to add new abilities. This means that while keeping the stamina bar is a viable option, it provides redundant structure, can be removed without affecting anything, and the removal both simplifies the game and reduces some of the future work in balancing abilities.