[itsme]

That's how it is, sure. But better compatibilty allows doing interesting things.
By now I used ChordPro for songs in MobileSheets as far as possible mainly to be able to transpose instantly.
As soon as I wanted to integrate chord grids or ABC snippets (btw. for such a combination ChordPro is by far the best tool that I know of, many thanks for your brilliant work) I used ChordPro, created a PDF and imported that into MobileSheets. When I needed such a song in different keys I transposed it in ChordPro and created a PDF for every required key. Doable but not the most flexible way.
Having chord grids and ABC supported natively within MobileSheets gives the maximum flexibility.
Maybe I will keep importing PDFs made with ChordPro into MobileSheets every now and then to make use of all the latest bells and whistles of ChordPro, but in general using the ChordPro files directly will be the fastest, most convenient and most flexible way to do it.
Another idea of a convenient workflow: I could create a book as PDF, with title page, TOC, CSV and so on from a selection of songs from my MobileSheets library just by writing a filelist of the songs that I want to include and let ChordPro do the job.
All this works best if there's no need to touch the ChordPro source - that's why I'm testing compatibility and point to differences that I find in the hope to improve the final result.