There is always a conflict of interests. What for somebody is a fairly good approximation could look abysmal to somebody else, and in this case, given people go through the hassle of using Lux to get some more realism, I tend to think any approximation won't be good enough. IMHO.

I would love if Luxpose does a serious effort in importing Poser materials as precisely as possible, but I certainly want to be able to tweak them, for some Poser material hacks aren't needed in Lux, and Lux has nice features (I'd like to use) which have no Poser equivalent.

An import material translator will help you to get a rough material setting you can tweak afterwards, and as this it is precious (setting up dozens of materials from scratch would be very tedious), but it's not a final solution. A final solution would have to be hand-tweaked, else there is no real reason to use Lux (no pun intended) over Poser's Firefly.