If the normal game is called "vanilla", this modpack should feel like a morning coffee. I have, in fact, removed most of the hostile mobs and new dimensions because they are the weakest part of what makes minecraft such a beautiful game.
There are some advancement which will guide to the new ways of obtaining mob/dimension specific items.
Other than that, this modpack is vanilla+ with the usual suspects (farmer's delight, quark, supplementaries ...) and it's open-ended like vanilla minecraft without a real endgame but tries to keep you in the so called middlegame.
P.S.
There is no way to obtain the elytra, you'll find more creative ways to move around quickly.
The difficulty will be set to HARD, but don't worry: mobs won't spawn (except for illagers during raids, witches inside witches' huts and cave spider from mineshafts' spawners).
I also decided to omit of one of the most used mod of all time: JEI.
I did this because the recipe book, quark with his Microcrafting Helper and the awesome Better Recipe Book Mod can effectively replace it—especially in a modpack that includes only a few major content mods like this one.