Poser does not require them to be welded. Sometimes it is a disadvantage to have them welded depending on what you want to do with the character. Single skin (welded, single mesh) characters can be used in Poser, but using them limits what you can do with them (geometry swapping, etc).

You can however export a character from Poser and weld it in the process, doing so will change the vertex count, and subsequently make the morphs useless in the process. But there is a way to get it back into Poser and correct the vertex cout/order with a creative little script. I have never used it, but it is out there and people do use it.

You can sculpt a non welded character without destroying it too. But I do not know the steps to do it in Zbrush. I would think that there is a way to do it, but there may not be.

I use Blender to build/sculpt/UV characters. It can sculpt non welded meshes and do all the other things complained about in the thread.

---

Some things are easy to explain, other things are not........ <- Store ->   <-Freebies->