I don't think people would want to enter their expenses manually. It is 2020, there are much better alternatives that you can explore. There are already apps that scrape data or gather spend data using SMS notifications etc.
It's for users who don't want to connect any of their bank accounts etc. to these kind of services. A possible feature is to import a csv and automatically add all the expenses.
A big part of the world does not have access to such automation.