If I understand correctly, the reason the developers are picky about it is because imgui has become common vernacular for a certain style of gui rendering. You

If I understand correctly, the reason the developers are picky about it is because imgui has become common vernacular for a certain style of gui rendering. You have retained mode guis rmguis, and immediate mode guis, imguis. It would be like if you initially named your project SQL before SQL was just a common name for any query language in a SQL-like syntax. Almost nobody actually means the SQL that IBM made when they say they use SQL, instead they usually mean they use SQLServer, or MySQL, or SQLite, or etc. Technically they are all SQL, but they all have slightly different functions and massively different internals. In the same way, there are several imgui libraries that all have similar APIs and architectures, but it's good to be specific about which specific library you're using.