I'm a fan of customisation, and I like how they did it in MK11. I'd love if more fighting games did something alike. However, I was not a fan of the preset variations in MKX, because that meant the moves were locked into that one variation instead of giving you the option to pick and choose the moves you like.
Sure, it takes a lot more work to make it balanced and make each move/ability viable enough for people to use it should they like it, but I really love the freedom it gives us as players. For example, if Jade only had her two tournament variations available, I'm not sure I would be enjoying her as much as I am with the custom variation I put together myself.
Hopefully NRS will soon make custom variations available in competitive play. If not, I'll just not touch it and stay in casual.