Hi tenro, I did a lot of the Path of War content, the Battle Templar included.
The reason I list PrC maneuvers separately is because they often have their own discipline restrictions for maneuvers gained, separately from whatever other initiating classes the character has. For instance, the Battle Templar can only take maneuvers from Golden Lion plus two others of the player's choice. So if you picked, say, Iron Tortoise and Steel Serpent, you can't take a Thrashing Dragon maneuver from a Battle Templar level, even if one of your other classes had access to it.
If I wanted to add the PrC's maneuvers to that of a previous class, I'd have to enforce multiple sets of discipline restrictions within the same maneuver list. That's not impossible, but it would be really difficult and time-consuming, and the result would likely be very buggy and prone to errors. In fact, just thinking about it makes my brain want to slither out of one ear and go to Coldstone Creamery - and I can't afford to keep buying all those extra toppings that thing always wants.
