Again
1. These people got early copies
2. They have had these copies for days
3. These are "professional" streamers/reviewers
4. They tend to be fans of the IE games and should be familar with basic mechanics and the ability to adapt to new ones
5. They are showing off how to play the game
I hold them to a much higher standard than some new guy who is playing his first 5 minutes.
Also, I find engagement to be very intuitive. When Josh announced it I thought it made perfect sense. This mechanic also exists in other games.
Points 3 and 4 are false to some degree. I saw streamers who played so badly that I don't even think they know
what IE games are and secondly I refer to what I said earlier, streamers with about 30 followers.
Some of those streamers are also too young to have played the IE games aren't they? (Unless they played them in recent years).