Read and write from/to CSV files, import frequencies from external sources such as Repeaterbook; copy, paste, channels like working in a spreadsheet.
RT Systems does all that too.
Also, save a file with the OEM software, then change the frequency ranges of the radio and try to write the software to the radio, even though the channels you’ve programmed are well within the range you chose. It won’t work.
It will with RT Systems and I bet it will with Chirp.
The OEM software is worse than simple; it’s bad.