Interesting thought, and love the animation! I wouldn’t be opposed to it, but personally I feel it’s a bit redundant as there’s features I’d rather see - but there’s no other swipe options, it works and it looks good, so it definitely works. But just like I said, it’s not a priority for me.
To my knowledge, for a transaction that has the business logo next to it (Tesco, McDonalds, TfL etc i.e. the majority of my transactions haha) you can’t see what category it’s in until you click on the transaction anyway. At that point, you see the category and just click on it to change it. I don’t feel that’s too cumbersome at all - rather, I think it’s logical and the perfect place for it!
Personally, I’d rather see a greater choice of categories, or the ability to add my own.
There’s loads of other suggestions, that don’t have any relevance to the expense category section, that I feel are far more relevant and useful than this.