Whether we want to boil it down to T&A (which is slightly simplistic), the basic fact remains: the overwhelming majority of Poser users are doing either glamour or fantasy renders, or a combination of both. By the nature of the case, "mainstream" is going to be what appeals to the largest number of that overwhelming majority.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3