I'm a big fan of the Affinity line, I own all three apps. Like many others here, I'm all too happy to ditch Adobe and use alternative software where I can.
I purchased Pixelmator Pro recently. The workflow for getting my content into Apple Motion is almost perfect, it's just not Affinity Designer.
If Affinity ever wants to reign supreme you must support solutions that help people get out of the Adobe ecosystem. Supporting Apple Motion shapes is a fantastic way to achieve that, you would make the Apple Motion user base very happy.