Whilst all you said about the programme is true, what Poser opens up as potential for creativity grows exponentially as your skills grow. I've been doing Poser since version 6, but have only really been learning some of the more complex aspects (like the material room) in the last few years. I've found that the more time I spend with it, the more exciting it becomes because as new aspects of Poser become less nebulous, your renders improve and your independence from the MarketPlace increases.
I agree: PhilC's Obj2Cr2 is amazing. So is Dimension3D's Poser File Editor and Morphing Clothes. Those two utilities have done more to make existing clothing that never behaved right suddenly do what you want it to do.
And then, this forum. You could literally spend months on here  - - or longer - - and not even scratch the surface of what all there is to learn about this programme. Just doing materials and lighting and textures and shaders! wow... I come home from work and check my Poser threads first for new gems from the greats.

No, Poser is not easy. Not if you want to do quality artwork. That's just classic marketing: "We have a Make-Art button!" ... however, when you finally render that image that takes your breath away and you think: "wow, I did that!" then you realise the effort and time (and dollars) and snooping around here on the boards has been worth it.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks