It is a great tool and has been game changing. But…
My workflow is inextricably linked to the way I use Notable.app and while I’m kind of happy with it, one way linking without a back button is a massive drag. As a markdown editor it is utterly fantastic. As an organiser of knowledge it is good, but could be better, but I can’t move on from it without a lot of work to migrate my workflow. I’ll get around to it at some point this summer but only if I get comfortable with a workflow in another tool first.
My point: be careful how you integrate these tools into your life. You are basically betting married to them.
They can be amazing. They can also be amazing 90% of the time and leave you high and dry in ways that make you want to move on, but cannot.