This depends on how you look at financing and budgeting (duh). But Firefly III was originally designed (by me) to lower your running expenses. It doesn't feature a lot cool budget automation because that leads to more charts but less money.

The original idea was to make it hard (or at least with some friction) to create transactions. This also excluded any way of importing data. That way you feel your transactions twice. Once when you spend the money, and twice when you have to enter it.

Making you finances tangible is a very good way of spending less money. Importing all your shit just gives GIGO but with nicer graphics.