Whatever you might think about Boeing's assumption that a MCAS malfunction could be treated as a species of runaway trim (apart from the fact that this was beyond at least two crews), I wonder if it fully analyzed all implications of a single failure (of an AOA probe).
Unless I'm missing something, if that happened in IMC, the crew would be faced with a stick shaker (on one side), a UAS warning, and a display showing the horizon moving above the flight path. Would they recognize that they had to ignore the first two indications and act immediately on the third? If they refrained from significant control (never mind trim!) inputs until they'd worked through the obvious indication problems, they'd have to deal with a flight path upset on top of everything else.
Perhaps recovering from that situation wouldn't be as challenging as it seems to this SLF. But sure seems a lot tougher than anything the accident crews faced. . .