The question asked was "Does AUTODESK offer a STP viewer?" No, as far as I can tell they do not. Freeware viewers are out there, but they're not REALLY free, but rather just timed trial versions.
here is a great one that we use: https://www.opencascade.com/content/cad-assistant
I don't think the person said or implied that AutoDesk should or shouldn't provide ability to view 3D files. They simply pointed out that AD doesn't have a viewer that works on .stp, which you took issue with, questioning (in a fairly rude tone, IMO) why someone would "assume" that 6 years later AD still wouldn't have a viewer that works on . stp files. But as demonstrated in the link you included, they don't. Which made your post pointless other than prove yourself wrong.
Why do so many AD "experts" get so defensive over their products? Seems like people aren't willing to acknowledge they're imperfect and their software, while amazing and the gold standard, is still very much imperfect and simply doesn't perform the way it's advertised to.
I use Inventor now. It's AMAZING, but imperfect. Managers read what AD is advertised to do and then wonder why we struggle so much to duplicate it. User error, must be.
the thing is Inventor is focused in this industry specific request.
.stp files are a common thing being used in 3D cad File Softwares. Why Inventor never made a quick Viewer for .stp files? Probably they didnt realize the potential profit. This is at the point where it could be added by a intern at Autodesk and no-one would even notice anything different. So much Open Source code out there to make this easy.