It's actually not that hard to blend when you consider just how big the Empire actually is. Therefore, the treatment can vary from place to place. You'll vary between the really high class, high gen slaves who are academics, clerics, military advisors, etc, and the ones who are just working in the mines and fields, and how many of what and how they are treated exactly will vary from Holder to Holder and region to region. (...)
Not to nit-pick, but that's not a
blend between 'USAmerican slavery' and 'classical ancient slavery' types, but if anything a stratification or balkanisation of slavery. Yes, I know, the Empire is a big place and that's time and again drawn up as a way of harmonizing the clashing accounts of slavery in PF. And don't get me wrong, it's not a bad way to do so, generally speaking.
But it is not really the way PF deals with conflicting accounts of slavery. PF simply ignores those conflicting accounts, basically. And the strategy of 'it's a big place' doesn't solve the problem of what is actually the border of what is acceptable practice in the Empire. "It's big enough" can be used to 'justify' anything and therefore justifies, imho, nothing. To this day we are left in the dark, largely, as to in which boundaries we can find accepted practices of slavery in the Empire, which practices are found, but not at large accepted in the Empire or even frowned upon by the majority, most Holders, the imperial families or the Theology Council, and which are maybe found, but outlawed.
If we have an account 'through the eyes of a Minmatar' in PF, which really displays slavery in the Empire in the stereotypical "blacks (referred to as sub-humans) worked to death on a plantation/in the mines" way, we have no idea how often that is actually seen in the Empire or how accepted that is as a practice. We have no idea how it would be internally justified in regard to slavery as religious institution, should it be deemed acceptable.
I'm also not sure whether it is true that "Holders are given largely free reign to determine how best to manage their charges". The Evelopedia article on Slavery suggests otherwise:
"A Holder is responsible for the religious education and conversion of his slaves. The nominal ultimate goal of slavery in the Empire is to eventually convert every slave to the Amarr religion and have them become free members of society. Thus Holders are encouraged to eventually release their slaves as they prove their loyalty and piety.
While many Holders view their slaves solely as a source of free labor, a Holder who never frees his slaves and mistreats them will be viewed negatively by his fellows and the religious authorities. Contrarily, a Holder who is too liberal with his slaves and frees them too regularly will be viewed as too lenient and radical.
To this end, a Holder is expected to be strict and stern, but not overly harsh with his slaves. They are given much leeway, however, for slaves who are exceptionally pliant and those who are rebellious and resistant. Slaves who cause problems and refuse to obey are typically given the most dangerous and harsh work, such as in mines."This implies that there are certain societal standards to which a Holder should pay attenion, unless he wants to suffer from according social correction mechanisms or be investigated by the religious authorities. Much leeway is granted
if slaves are
exceptionally pliant or rebellious and resistant: But arguably not all slaves are either the one or the other, else it would hardly be 'exceptional'.
So, "the Empire is a big place" does not answer the hard questions here, I think. It is too much on the side of "everything goes", while we do, on the other hand, have PF that suggests that there are certain restrictions put on slavery: What I cited above, the mention that the TC deals with any crime considered religious, including egregious mistreatment of slaves, the account of the beginning of the Reclaiming and the decrees of Amash-Akura on how to treat enemies (slaves being basically justified as captured enemies who are re-educated) and the ruling of the Council of Apostles in regard to freeing slaves.
Also, @Louella, this is kind of the background Nico comes from: Her family is 'freed' by now for loyal service, but before they worked their way up through knightly and administrative endeavours.