Do Stratagem categories mean anything?

[Valkyrion]

Epic Deed, Battle Tactic, Strategic Ploy etc? 

Do they serve a function I've missed during my 11th prep? 

[Xenith]

Not that I can see. They played a small role in I think late 8th where certain characters like Dante got a free use of a Battle Tactic stratagem, but nothing since then.

[Inquisitor_Lensoven]

They sound cool. And looking cool and sounding cool are the most important things.

[Tawnis]

They were just a broad description of the type of stratagem they are. 

Battle Tactics are straight buffs to damage or durability: Things like Armour of Contempt to reduce enemy AP, or one that give damage buffs like Dev Wounds, +1hit or wound, Ignores Cover, Sustained or Lethal hits, that kind of thing.

 

Strategic Ploys modify or change rules of the game: Things like embarking in a Transport out of phase, getting an auto advance amount, returning units to reserve, stickying an objective, that kind of thing.  

 

Epic Deeds are a little more nebulous and the least common, but are for cinematic moments: Things like fight on death, auto deadly demise, retaliatory attacks, those kinds of things. 

However, looking at the new 1DP detachments for 11th edition, it looks like this has been done away with.