Originally Posted by
Medestruit
I mean, if you're talking purely aesthetics here, this is why I build all my "action bars" as WAs. I only see what I need/want to see, and the actual physical action bars can remain hidden.
If you're talking about Bar Button 1 using a talent specific spell, and you want that button to remain populated when a different talent is chosen, I use talent macros for this. So for instance with my DH for havoc, if I'm using felblade, the macro will show that skill in slot 1, but if I do not run felblade that spell slot will use demon's bite instead.
The process of keeping relevant abilities populating your action bars is kinda a bit of foresight in the sense that you need to have action toggles like macros for when abilities change or better talent builds come out for whatever class/spec. I generally set my main action bar up the same way with every class/spec, boiling down the basics of 1 energy builder, 1 big attack, 1 energy dump attack, 1-2 AoE attacks(depending on how the class plays and available abilities), your interrupt and then the artifact abilitiy. This is the bread and butter of every tank/DPS spec in the game, so I keep that simple setup for all my toons. I always place my abilities in the same keybind slot, so I know my AoE abilities are in keybind [whatever] and my interrupt is in keybind [whatever else], etc. This way, regardless of how long it's been since I've played a specific toon I have the basic idea of where each specific button is without having to look at my physical action bar.
Then as Aok said, I have some miscellaneous bars for things like potions, racials, shackle/imprison/incap abilities, food, hearths, mounts(though I also use oPIE for mounts/spec/hearths), immunities and trinkets. Again, I plan these accordingly with every class. Things that aren't necessarily used often enough to occupy a main action bar slot, but have uses.