yes, it seems most trackers paste over. In spreadsheet, ctrl+V also pastes over.
Users can consider a workaround for pasting and inserting, it's just inserting blank rows with insert and pasting over the blank rows.
I also suppose most people want to write over a single part in their pattern, (let's say from row 10 to 20) while the end of the pattern can be correct (from 25 to 40). So just shifting notes is not really conveniant in this aspect. But maybe it's just me.