You're welcome, Ack, I also thought this article by Doug Schneider was a good find.
As for the ringing, I just don't hear it. I just don't understand the claims of 'temporal blur' and transient smearing as being a clearly audible issue. Piano music seems particularly critical regarding transients, and on very high-end systems I have heard enormously realistic, dynamic and clean rendition of piano from RBCD -- including hard attacks in the very high register (Stockhausen).
This 'temporal blur' thing seems just clever marketing to make audiophiles panic into thinking they must have MQA. A solution to a non-existing problem. Very clever.
Also, the pre-ringing is only on an impulse signal; as engineer Dan Lavry, a siginificant player in the field (Lavry DACs), states, this is not relevant:
"Your signal (data) is NEVER a single unity impulse preceded and followed by zeros. That is not a real world signal, such signal represents infinite bandwidth."
Link:
https://www.head-fi.org/threads/digital-filters-and-pre-post-ringing.447372/
As one guy (poster KeithEmo) puts it well here:
https://www.head-fi.org/threads/tho...-get-you-to-think-about-stuff.693798/page-379
"while all digital filters ring at least a little - so do microphones and speakers. In other words, many of the signals that DACs can't seem to reproduce perfectly are also the sort of signals that don't exist at all in real life and, if they did, microphones wouldn't be able to record them accurately, speakers couldn't play them, and vinyl and analog tape couldn't reproduce them accurately either."