When a team changes the game..
So a lot of what you said is in that, but an era to me is not a checklist..
Like have to have 10 tournament wins. 1 major. top 4 for 12 months..
Even if those are a big part of having an era, I do not think it should be reduced to a checklist.
But changing the game, lets take Astralis. the team that have had the greatest era.
They changed the game 3 times in their run. and it got better every time.
They are the reason the game is so good right now. why teams work so well together why we get so good CS. Before that it was way more just 5 single players running around ( a bit moderation with that but )
And they dominated the scene, it was always just Astralis that would win because no one was close to doing what they did. and no one have been since.
They did more than others before, during and since.
It was something special. something you do not see, something that is very hard to do.
That is an era. game changing.. something that is more about just winning, something that you have to be a very special team to achieve.
And with that, you will ofc have to win tournaments, majors, and be high in the ranking for a long time, because you wont be something special if you are not that.