Make data type selections like in a json deserialize or excel to record list more dynamic. The easiest way would be a text option for those things. If any of the data type names equals the text, use that structure. That way a lot of unnecesary code could be deleted and that's what I'm missing from day 1. I don't like the fact that you have to make an enormous switch case in order to get it to work.

For example; I want to create a backup and restore system. But the application is growing. If my application has alot of entities and growing it would be very annoying to update the backup and restore system for every entity that is new. You want to make it dynamic, makes it way cleaner and don't need to do any maintenance on these kind of situations.