If I had to suggest something:

• Quick switching between accounts on different instances (a couple of clicks, instead of another website in another tab)
• More configurable UI. Quickly switch between seeing/not seeing read posts, NSFW, NSFW blur
• Combined communities list and/or wall between all your accounts, so that you see more

Cool! What do you want to add to it to distinguish itself from the browser version?

*covfefe

Does “Reject All” also object to legitimate interest?

As more and more people get direct fibre optic connections, this advantage will get smaller and smaller…