@Hymnote You’re right in a way. But not quite.
When determining your DPS, it’s usually done over a 2-3 minute window indeed, because the final number should barely change over longer periods of time, if you’ve got your rotation down.
However, those tests are usually done against training dummies, as it’s supposed to show you in the best possible light.
Obviously, like you said, due to boss gimmicks, movement required, and just technical issues like lag, that number will be smaller in practice.
In my XIV Linkshell when talking about boss fights, everyone used their actual DPS at the end of encounters, and I guess your social circle went with the theory DPS, so to me it looks like you misunderstood me my friend.
Now as for DPTS, it is a legit term. Or was at least. It was used in a game called BattleForge which I spent a lot of time on and the term stuck. Game is dead now, and I did a quick google search for DPTS, but it seems that’s the only game that ever used it. Quite a shame really.
Majority of video was taken up by two casts of Cyclone, which definitely doesn’t reflect dude’s actual usefulness. Someone could cast his best single skill, check damage done, divide it by animation time, and claim it as his “DPS”, but that’s not how it works.
But let’s not turn this into MMO glossary trivia thread, that’s not what we came here for, is it?