Any NTFS partition is NOT
fully stable when written to, when the background 'Windows file manager' is not running. This is NOT an absolute, as just editing an existing file may not cause a problem. However, creating a new file or radically changing the size of a file will sometimes cause problems.
There is more than one method (for performance advantage?) to add extra NTFS blocks, etc. and Windows may arbitrarily 'assign' a method. There is also anecdotal evidence that NTFS has changed slightly (and repeatedly) for each Windows service pack (and major release).
When you write to an NTFS partition, and then re-start Windows, this can automatically trigger a CHKDSK run. This will also occur if you re-size the partition.
A given implementation of NTFS may not handle a partition in the exact same manner as another. This still means that an NTFS partition solely under the control of Linux should NOT
Conclusion: Writing to NTFS should be possible, and should cause no issues. However, until better documentation and standards are available this may still cause problems ..