Tab target combat puts you atomatically on a timer if you are not a Class with kiting mechanics.
Is a game of depleting the enemy health bar before he depletes mine on a timer.
And on top of that, is a holy trinity game, meaning no class is designed for "solo-content"
There are some imaginative ways to make a Tab Target combat system fun...and im sure Blizzard already explored every single on of them after 16 years.
Some examples:
-Dont stand in the fire
-Go grab a buff over there
-Avoid more fire
-Dont look directly into his eye
-Stop damage
-Do damage
-Hide behind a pillar
While a Combat system game relies on:
-Immunity Frames
-Avoid telegraphed attacks
-Combos
-Juggles
-rolls
-Collision Detection and Hitboxes
The most important part is that there is no "timer" in a combat system and is possible to take zero damage in fights (with skill ofcourse)
This games were built from the ground up to be played solo and without a holy trinity system. WoW wasnt.