Do you have ideas for a plugins API (Spigot)?

I'm currently programming an API to help me develop and write Minecraft plugins
So I wanted to ask you if you have ideas about what kind of methods you would expect from such an API, because I do not really think of much.

You'll find most of Spigot missing in Sponge, so you can save most of your work.

For example, there's a very intuitive command system and an economy API is already integrated.

Not everyone wants to program Sponge plugins.

It is worthwhile, however, to change. In the long term, Sponge will probably prevail as it is much more modern and better implemented and now you can find more than enough plugins.