That gives me pause. And it's not quite what I said.
When you try to integrate everything into the same application, you have to make compromises. Even if they have separate workflows, you're not optimizing a tool for a specific use. You're creating something general-purpose.
InDesign, Photoshop, and Illustrator are separate applications. That allows each to fully specialize in what it does best. And each one does a hell of a lot of things that would simply bog down the other two applications.
The applications need to integrate with each other. But no single application can be excellent at literally everything.
Edit: oh, Affinity is made by Canva? Yeah, I'm not touching that shit. No reason to trade one evil empire for another.
It's because Adobe truly does have the best feature set. It's partly because they spent so many years building good software, and partly because they own patents that prevent other tools from operating in some of the same ways.
Adobe applications are interoperable. I can seamlessly move content between them. They all have the same interface and work in basically the same way. I can (and have) put together a 300 page book while taking advantage of many advanced automations. And back before Adobe went to shit, they really did put a lot of effort into making their interfaces intuitive.
And when you have 25 years of muscle memory dedicated to a set of tools, it's REALLY difficult to completely replace your whole tool set.
"Your mom" jokes.
Also, your mom.