It can usually be worked around: but it's an irritation.

It can usually be worked around, but often newbies don't know that. They may not even know there is a problem.

For example, I'd been using Poser 5 for a year before I realized that PP MATs don't work correctly with P5. I suspect many P5/6 users still don't realize that. It doesn't seem like a problem, because the item still "works" - you can render it, and it looks okay.

But it looks much better if the bumps are attached correctly. If I were the modeller or texturer, I would want it to look its best. As it is, I bet 50% of DAZ's customers are rendering V3 with incorrect bump maps, because they assume the MAT files work in P5/6. I did, for almost a year, and I thought DAZ just had poor-quality, muddy-looking textures. I was telling people not buy the DAZ textures because they're overpriced and ugly. But with the bump maps fixed, they're great.

The thing is, these days newbies are likely to be P5 or P6 users. When you buy a new program, you usually buy the newest version. They are not likely to know how to fix these problems. While the PP users generally will know; they've been using PP since it was new. IMO, it makes sense to make your products compatible with P6, and let the experienced "legacy" users tweak as necessary. Instead, most Poser merchants do the opposite.