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That table shows the CR of a single monster that is a high difficulty encounter for a party of four characters of the listed level. So, a 7th level party can face one CR 10 creature. That creature has, on average, 165 hit points and AC 18.https://twitter.com/newbiedm/status/1883974615946649969Tasha's alternate classes features were supposed to be new ways to play each class. For instance, the barbarian might get an alternate rage that augmented speed, allowed the use of Dex weapons, and had some other benefits. It was supposed to support the next 5 years of the game.
As a DM, you have to describe both the room and the hallways depicted. That includes the location of four doors and three corners. That's a fair amount of info to juggle. How much of that can the players actually process?