Why import is so bad between Adobe XD > Illustrator

The import between Illustrator > Adobe Xd is excellent, that's a fact.
But when you work for example on a web design in Xd, and you want to translate it into a flyer or something in Ai, it's a mess.

For example, when you want to copy and paste from Xd to Ai :
- Gradients are not supported in the CC Library.
- Apple Emojis are not in charge automatically, like Xd, in Illustrator.
- Multi-lines texts are transformed into several individual lines.
- Group that contains image(s) are transformed into a pixilated png.
- Masks are random, sometimes working, sometimes not, no explanation why.

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