and you’re free to enable as many or as few as you'd like!
I think it's important to qualify this by saying that once these things are activated they can't be deactivated. Because...
Please note that once enabled, these features will roll over to your saves on PC
That sounds like you can't even go back to an old save if you don't like a new feature?
Pet Power
Pet Power greatly enhances the summoning class and its infusion spells. With this feature, you can cast infusion spells on all available summons, not just your own Incarnate. Each summons receives different skills depending on the base elemental infusion type.
Nifty. Seems like this always should have been possible.

Thanks!
Combat Randomizer
When entering combat, one or more random enemies will receive one of the new special statuses created specially for this feature. Think you know how a particular fight is going to go down? Not any more! This will change everything you thought you knew about combat, with each battle presenting a fresh new challenge.
Is there any incentive to use this? Better loot? Higher XP?
Nine Lives (Black Cat+)
Transforms the Black Cat into a follower. Once rescued, a whistle will appear in your inventory. You can use this if your cat gets lost or if you want to change who it follows.
Seeking some clarification on this. So the cat follows you around until you "save" it. Then it, essentially, becomes a summonable skill. How does Nine Live change that"? What does "transforms into a follower" mean?
Improved Organisation
Find a collection of special bags that allow you to better (and automatically) organise your inventory.
I'll support some of the comments above in wanting to be able to destroy some of these bags that we don't want.
And I'd also prefer it to not auto-sort my inventory when using the "Pack" option of these bags. I like to setup my inventory in a particular way and these bags smush the inventory all together and mess it up.
Sourcerous Sundries
In each major hub, you can now find a mysterious vendor selling exotic and potent artifacts. These artifacts can upgrade a character’s gear with immense power, bringing them up to the players' current level.
Can someone please explain this feature in detail? What and how it upgrades things. How much it costs. Etc. I'm not sure if this is going to feel like a "cheat".
Hagglers
Tired of forgetting to switch to your 'haggling' character when talking to traders? Now the reputation and skill of your whole party can help you wrangle the best prices!
So, I've got the same question about this as I did
Lucky Charm. If we use this feature, will our Bartering score be the cumulative score of the entire group (playing 4 person co-op)? Or just the highest?