3) Their personel keeps calling it Affinity in communication here and there. So I would be surprised if the name Affinity would vanish
It would make sense keeping the name somehow; there are a lot of positive articles, reviews, and word of mouth found with any fast Google search. This is just pure golden rules in marketing; I wouldn't throw that away (but you never know). It's a very strong presence, which means everything in SEO. And mostly, that the brand and product names are well considered and have good prestige, unlike with other companies and products.
Browser-based wouldn't be that great for professional work for heavy raster files for print, RAW processing, etc. For UI/UX prototyping? Sure, Figma is total proof that such kind of browser based design app works well for professional teams. But as long as it's that, UI/UX, low fi graphics.
I don't think they can discard desktop without discarding the pro world, honestly...
Affinity suite v2.6.4.
Ryzen 9 3900X, 32GB, nvidia 3060 12GB.