Proper & safe HT bypass is possible via BluOS presets. This has never been a problem for me on the M33 in over 4 years. The M66 even has the option in analog mode of bypassing the BluOS latency of at least 50ms, which not every surround decoder can compensate for.
Should have known the NAD shill would turn up here!
No, it is not a safe and acceptable means of HT Bypass using the preset feature, not by a long shot. The user Nocko has explained this to you on several occasions in the M66 thread, if the input is changed then the volume remains at home theatre preset level, i.e max! - every time you change away from the HT preset you do not want to have the device left at literally speaker blowing levels.
Tbh it sounds like an easy firmware job really, assign a default volume to each input..... hopefully they will do this, but until then it's not a safe (and more pertinently idiot proof) method.
FWIW I have to perform a similar enough function now with my gear. I use a Schiit Freya S as my preamp and therefore to get a HT Bypass of sorts, I switch it passive mode and wind the volume to max. So I am used to being methodical with engaging in and out of a pseduo HT Bypass mode and checking volumes before playing content on other inputs - but at least with the Freya things are of a more physical and deliberate nature, and critically there's no risk of switching an input via an app.
I would not be so obtuse either as to say it has a safe and effective means of HT Bypass, merely a tolerable workaround for basic situations. And most certainly not one that would suit say a family situation where anyone can grab a remote and be free to flip between music and movies etc with out risk.
Anyway, to the A10....
In short, if I summarize correctly, today, a preamp with two XLR sub outputs and real bass management... there is only the Anthem STR with ARC and the M 66 with DLBC... the two sub outputs of the A10 are just there to sell to suckers...
Why would the dual sub outs be for suckers?
It appears the A10 will provide the facility to delay mains and subs, and provide full DSP (crossover control and PEQ), then that's literally everything you really need to get an excellent level of sub integration (assuming sufficient knowledge with say REW). Certainly better than your typical preamp that expects you to use a full range preout to a sub(s), and no means to delay the mains.
It seems like it will also have it's own correction system as well, although for my own use I would have been ok with a lower price and no automatic system. Unless it proves to be as good as say DLBC, in which case it might help justify towards the cost of the unit.