Old/Obsolete file format import still needed?

[Bryan Quigley]

Hi all,

While working on the easyhack[1] to remove export of obsolete formats
I came across a few that I think we might want to drop import support
from as well. I cam across them again recently looking at another
cleanup bug[2].

They are:
Mac Pict (obsolete since Mac OS X)
https://en.wikipedia.org/wiki/PICT

PBM,PGM,PPM
>From their website (below) there might be some users who still like
using this file format. But given the likely user I'm guessing they
will all just manually use ppmtojpeg to make it a jpeg before
importing into LibreOffice.
https://en.wikipedia.org/wiki/Netpbm_format
http://netpbm.sourceforge.net/doc/#formats

OS/2 Metafile (.MET)
Known bug - With MET files you can not export them as an image (a
different filetype) using "Save as image".  You can still export a new
image by saving the whole document.

In most cases I would expect a dedicated image program to be able to
do a better job with the above.   I was hoping to get some usage
statistics about these formats, but haven't found any (suggestions
welcome).  There also might be a security benefit by not having to
consider these formats (less import code to harden).

Thoughts?
Bryan

[1] https://bugs.documentfoundation.org/show_bug.cgi?id=92925
[2] https://bugs.documentfoundation.org/show_bug.cgi?id=38844

P.S. Please copy me on replies.