The B747 had engine "issues" the pilots knew about this "issue"
They even demonstrated the "issue" to the engine manufacturer management during flight - twice I believe.
MCAS was hidden, then covered up with a gloss over after fatal 1 - it is still fine after Fatal 2, but needs a minor tweak - but know pilot will know the stick feel change when it is required but can not activate until "they enter that zone"
But if 0.6 was the design figure but 2.5 was required - expect a surprise on the edge of the envelope when things are most probably not going well by this stage anyway due other factors, that put you at the edge of envelope.
It will be nothing like waiting for a engine to explode - that you are half expecting.