I'm curious to see the general perspective on what people in the Industry think when it comes to modders.

Sure, the best case, dream scenario would be what happened with Long War and Xcom 2 and no doubt if your modding for a specific company's games, that company will likely look favorably on your efforts.

But how do other companies view the moddders of another? (In general?)

I know Blizzard doesn't seem to care, unless you’re doing it for them. (I was told this directly by one of their recruiters, "Great passion, great experience, but it's not for our community".

Do yall think such perspectives common or is this kind in-group behavior rare?

Sure there is a wide quality disparity in most modding communities, and of course, changing skins is no match to making entirely new assets.

I guess the question is how much respect do mods of other, (not just rival) products get between companies?

Let's assume the mod in question is done right across the board.

I guess it all depends on the company culture?....

Right,

I'm asking if moders for a company's games are seen as useful to say, a totally different company.

For ex.I mod an EA product, and well EA isn't exactly the grateful types....