Indeed. A classic example is the concept of control. Back in the PVE only days, control was indispensable. Every time you aggroed a mob, other mobs nearby would also tag along. So controllers stepped in to subdue them while the DPS and tanks went to work on the main target.

But while it is fun to keep a mob helpless for minutes in PVE, being at the receiving end of it in PVP is no fun at all. So these days control has pretty much gone byebye, or is heavily curtailed when applied to characters rather than mobs.

Another thing is that in recent years games has gotten more "furious". Back in the day a fight good fight could drag on for minutes, with each side trading blows and coming up with strategies and counter strategies as the fight ebbed and flowed. This put brains ahead of player brawns or reflexes.

But now it is all interrupts and twitch. Dodge this, block that, constantly moving out of fields and looking for "tells".