That Samira, is what I call the new PF. It's more categorical, black and white, and overall, has set or reversed limits and clarifications on things that were more... subtle in the past. Can't really bring up quotes and articles obviously, but that's mostly my personal experience. There are actually a lot of counter examples to "the Amarr tried to erase every bit of Matari culture". I wasn't citing the Amarr-Minmatar Cultural Recess above for nothing. There was once a LOT of stuff revolving around the Ammatar and how they represented a mix between the Amarr and Matari culture.
I may be a bit seeing too far into it but I have always held that view that while the Amarr enslaved the Matari, as most other races before they didn't really try to erase every bit of culture those had. I mean, most other races either joined willingly out of admiration and pride (like the Khanid) and so embraced it willingly, or where technologically so inferior that the Amarr descending from the skies in huge arks of wonders would probably have been seen as near gods. As for the Udorians, even if there was a long wars against them upon generation, they have actually had a huge impact and transformation of the Amarr society from the inside, which mean that the Amarr Reclamation was not so much about the cultural aftertaste, but just about the conquest itself.
Then came the Matari, which was a little bit bigger to chew since they were also a space faring society, albeit less technologically advanced. They proved to be a new challenge and difficulty for the Amarr that while they had that huge reclaiming experience, had not very much experience in actually shaping and erasing a strong culture that actually dared to resist. Well obviously they tried to eradicate a lot of its tenets that were the most 'dangerous'. It is said clearly in PF that a lot of Matari history has been carefully erased from all archives.
However I think there are a few subtle hints that I actually consider as very revealing about the Amarr integration process after having reclaimed a culture. While the Udorians are here to prove it, there is also the case of the Ammatar Mandate. While the Amarr had to suddenly face a culture that was so hard to integrate and tame to their Faith, they also saw in the Ammatar a way to prove that they could actually integrate the Matari culture into the Amarr Faith, and brandished that new cultural construct as a proof of the success of the Reclaiming of yet another culture that now thrived under its own faith and differences, but united under God. The Ammatar case in itself was the direct response to the Matari rebellion, as a slap in their face as to show that their reclaiming was definitely not a failure, far from it, and that yet again, it worked.
As for the Udorians, but even more in this case, I think that trend that is maybe not initially intended with each Reclaiming, is actually a good hint at how the Amarr like (or are content with) puppet cultures retaining their exotic flavour and still following the main tenets of the Scriptures, all in fear and devotion to God, yadayada. Much like the western world was very found of everything that followed their culture and came from exotic nation during the colonial times, if you will, though the analogy sounds a bit weird to me.
Also, the Book of Emptiness chronicle as I recall it, was a direct and clear hint at the religious tolerance and hunger for everything new and ground breaking related to their beliefs, but that, of course, under extreme cautions (cf the guy that actually guards the theologian/archaeologist and the duality they form, that's a direct metaphor for the duality between the dogma and the enlightenment of the amarr society).