I don't think previous iterations of the 737 were fundamentally safer. As there were probably other changes done to the 737 Max beyond the different engines, li

I don't think previous iterations of the 737 were fundamentally safer. As there were probably other changes done to the 737 Max beyond the different engines, like improving the overall build, I do think that the fixed 737 Max should be safer than any other 737. The issue with the Max was, that a software, which should improve the handling in extreme situations, kicked in in normal conditions and the pilots failed to handle this (runaway stabilizer procedure). And indeed, the software for the MCAS was really badly designed, which has been fixed now and by now every 737 pilot should be aware how the two crashes could have been prevented by the right crew reaction. Both of this should mean that these accidents won't happen again.