…...QF1 conducted a 180 degree turn, descended 1000 feet to the appropriate hemispherical cruising level, headed to the nearest suitable airport, and did not descend for 23 minutes.
QF1 (assuming you mean the very recent event) had a single
intermittent failure indication, followed the checklist instructions that did not include any mention of an immediate descent requirement, and diverted to the nearest suitable airport - probably after discussion with engineers via satcom and clearance from ATC. At no point was there a checklist directed requirement to do other than a normal descent as per normal SoPs. All indications are that this was a very different scenario to MH370 so your comparison is not particularly valid.
Are you
now asserting that MH370 did not have a pressurisation problem that would have required an immediate descent to 10,000ft or LSAlt? If so, even if the crew were overcome by smoke or some other contaminant, why did they not make a single radio call to advise of their emergency and required diversion?