Why Convert Gutenberg Data is not default?

Is there a reason to Load & Save options be turned off?
They seem super usefull and with no downsides… (?)
And, looking at the future of WP, is it advisable to turn on Convert Gutenberg Data on?
Does it turning it on after editing some pages and posts, and creating CPTs creates some kind of problems?

This feature in its current state is really only meant to migrate data between Bricks & GB. Not to continuously/interchangeably edit the content between the two builders. Once GB has implemented its full site editing plans, we’ll look into a more in-depth integration.

Makes sense.