https://youtu.be/jG1Aat1XdbI - This is a video of me grouping with a 54 Necro and a 56 Enchanter, both of whom are charming pets. These two players are people I met today, and we are not coordinating over discord. This is an example of a pickup group.
In the description of the video you should find the logs. In this play session, we kill 77 mobs, and I cast Ice Strike 76 times, and used JBB once instead. The average kill speed is around 40 seconds per mob.
It is almost like you could create a solo video
https://youtu.be/5XwiGKTuu2E and translate that DPS in to a group scenario. X Ice Strikes per average encounter of Y seconds results in Z DPS per fight on average.
That is the thing about averages. Some fights you may cast Ice Strike multiple times, some fights you don't cast it at all, but the average smooths this out.
I am really not sure why this wasn't obvious already, or why it needed hundreds of pages of trolling. The idea that you "cannot use solo videos for group scenarios" is debunked.