Does the Cubase manual also say, or otherwise Steinberg endorse, turning HT off ?
I don’t want to derail the OP concern, but just a quick comment on HT- this is probably one of the most unclear areas in Cubase’s design and operation for the general public, despite the minimal incremental feedback provided on ASIO Guard when implemented in C7. IMO, the way you presented your argument on HT above is not technically accurate, as there is no rearrangement of events between cores. What there may be, is an interruption of the RT flow due to other threads competing for execution, which can translate in drop-outs if the ASIO buffer is not filled timely as a result. But anyway, carry on.