Endless customization!

While the default settings are very unbalanced and honestly hurt a lot of things more than they help, the mod is SO customizable through configs and datapacks that you can basically make it anything you want.
By default:
-Sugarcane grows to world height, and cactus grow 5 blocks tall.
-New enchanting system, which is very great and I don't need to make changes to ever.
-Spawners can be upgraded, and in the config you can change the item required to upgrade different stats, by default it's pretty easy to make it ridiculous. You can also change the level of Silk Touch required to mine a spawner and keep it.

And the systems which I always have to change extensively, Affixes and gems
By default, gems spawn from enemies at a decently high rate, they spawn in structures and they can be created by the player using other gems. Gems aren't very strong generally and are very chance based.

An affix is another way to refer to a stat, affix gear from my understanding just means "gear with a stat boost" For example, an iron sword with increased crit damage, or a shield with increased movement speed. Anyone want moon gravity pants?
Generally, these are weak on low tier equipment, which can be gained from random zombies, and in overworld chests.
High tier affix equipment can be gotten plentifully in the End, high tier affix gear is ridiculously powerful and needs to be purposely tweaked if not fully removed most of the time. If you don't care about balance, then you shouldn't worry about this part, go explore the end!
You can "salvage" the gear and gain "affix materials" which allow you to apply affixes to any gear, not just vanilla! You too can finally have your cotton candy affix sword! If you don't have any mods that add gear, that's okay, you can use it to reroll your affixes instead! It's basically an enchanting table that works on previously affixed gear.

As I said before, you can change (almost) everything in the mod! Don't like the enchanting? Goodbye enchanting! Only want the sugarcane to grow a little? Sure! Perhaps you wish an affix to deal 100 thousand damage? I don't see why you would, but you can!
I generally remove ALL natural ways to get affix gear, and allow you to gain the crafting materials yourself through a complex crafting tree using the KubeJS mod. This is generally beyond a normal player, I suggest disabling boss spawns so that the equipment is rarer.