And Fisheye perspective - the sorts of perspective tools that you can make as seen in the book 'Prospettiva ZeroSei Manuale di Prospettiva Lineare e Curvilinea' that would be a godsend. I can work just as fast WITH REAL perspective drawing tools. But I know how to draw perspective, I don't need to cheat the workflow. If I wanted to draw each face to a building individually with a HEAD ON view, I can transform them into perspective. Now Affinity has the Perspective Warp, which is cool. but even their perspective tools pale in comparison to what you can do with Krita's Assistant tool (Of course, Sketchbook Pro's tools for perspective work a bit better, but they just aren't as versatile). The only exception to the rule is Sketchbook Pro.

The problem is this: Inside programs like Photoshop, Affinity products, and many others - there's really not any tools for working in perspective. I was using it as my primary art program before purchasing Affinity Photo and Affinity Design.

Krita is a free open source piece of Painting software.

Drawing program krita