I use Mezzmo and a Sony W800B TV and "Sony Bravia KDL 2014 Models" as profile.

I can soft code my subtitles using MKVToolNix in seconds and then use Mezzmo to watch the video with subtitle on my TV. If I use Mezzmo it tries to remux the file which takes a much longer time.
But why can't Mezzmo do the soft coding part as MKVToolNix does so I don't have to use another software for soft coding the subtitle?