I've been using the Affinity programs for a few years now. For the most part I'm really happy with them, but today I started work on a document with many slices (with more being added) and it turns out, the export persona is very lacking in even the most basic features:
No way to reorganize slices in the Slices panel
The fact that we can't reorganize slices in the Slices panel makes it impossible to keep slices organized. This is necessary for grouping, selecting, and modifying slices easily, which quickly becomes frustrating with the current lack of organization functionality. I just want to be able to drag-to-reorder slices in the Slices panel.
No Copy/Paste/Duplicate
"Creating hundreds of slices of identical sizes and settings? Too bad, you need to create every slice individually!" If I have multiple slices for each element (up, down, hover, etc) and I need to create 50 of these elements, that's 150 individual rectangles that need to be drawn, renamed, etc. This can take hours. This workflow is a nightmare.
No Auto-Slice
This one surprised me. There's no way to quickly slice around existing elements, or auto-slice by grid, etc. Again, this forces users to hand-draw each slice rectangle. Nightmare workflow.
Lacking multi-selection edit
Selecting multiple slices should let you modify the properties of all selected slices. The Export Options can be modified together, but changing or adding multiple export formats quickly becomes tedious (and impossible, when you get into the 100s of slices range)
I've been a huge proponent of Affinity over the past few years, recommending it at every chance I get. Lately though, the lack of functionality (and usability) in the Export Persona makes me regret my decision to go all-in on Affinity's ecosystem. (Not to mention the bugs on Windows, but that's a topic for another time)