Limiting Factors

- Each move in the game currently requires the use of a resource:

HP, MP, and TP.

- In addition to these resources we have extra limiters on skills and abilities:

cooldown times, casting times, and animation times.

All of the above mentioned are acceptable and make sense. These are typical with any MMO. The stamina bar adds an additional threshold on abilities and actions that is cumbersome.
casting times and animation times are basically the same thing, so there are really 3 main limits currently. The recast time, the animation time, and the stamina bar. The issue with the stamina bar is that is acts as a universal cool-down timer, which is redundant since the animation times also act as a universal cool-down. Every ability has a recast time, minimum being the animation time, as well as a universal cool-down time, being the animation time. Removing the stamina bar would change little in the current gameplay, but would remove a cumbersome element.

As for auto-attack, there are both pros and cons to an auto-attack system. The biggest issue I see is what happens when people want to use a higher level ability as their base attack. As for meshing with the stamina system, auto-attack would be much easier to implement without the stamina bar, but the removal is not necessary.