Microsoft apps were an example of that, but have since been updated to properly list TTC fonts. For instance because the TTC file for Hevetica contains FOURTEEN styles, it doesn't work well with apps that are used to old font 'family' of' the typical four styles (Regular, Italic, Bold, Bold Italic). There are still many problems with the TTC version with certain apps, even on a Mac.
If you're using a Mac, and have Helvetica Neue, yes, you are good to go FOR NOW but really, it's time to move on to OTF or choose a new typeface.
