Probably most of the above. Imagine that in order to change fonts in Word, you had to use a font editor - or that Notepad was the onlyy tool to create a web page. A useful feature implemented/documented in a way that expects more than the average user is capable/willing to go through to achieve the result.

"These were from two of the biggest vendors in their respective marketplace categories. I'm not saying they didn't know what they were doing. I guess they were maybe just targeting the majority?"

That is probably true at least to an extent though I wouldn't necessarily assume that being good means that they understand it anymore that the customers they are catering to. Even an easy one click solution provided by some plugin is only going to achieve limited penetration. Put it in every version of Poser. Making it a 'Pro' feature or requiring people to convert things manually means they'll continue using the 'legacy' techniques. Its as simple as that. Musing about how people are lazy, dim, ill informed, backward etc. passes the time, nothing more IMO.

 

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken