Many of us need to solve that text export issue or stop using PSD*, in my weekly agile flow I need text properties to give enought specifications in hand-offs with IT team, they use https://psdetch.com/ that gives information about every layer in PSD. The solution Designer » PDF » Illustrator » PSD requires an additional license.
When I discovered Affinity Designer I love the way you can work with "responsive" content and libraries, but I never used Pixel or Export personas for UI design**. Sure you know Figma, they have quite nice interaction development (limited but very usable) and hand-off sharing specifications, nice to have options.
*It'll be near perfect if we can use SVG multilayer to give hand-off specifications :)
**Yeah I know it's a very specific use of Affinity :D