Re: Will the 737 MAX ever be safe?
The point about the 737's not carrying containers _is_ a major issue with some (most?) operators, but for others it's actually a benefit. Southwest Airlines, for example, like the low-cost ground handling equipment (aka "people"). You can climb into a 737's cargo bay (and wheel wells) without ladders.
(Well, I have done. although to be exact the 737 I did it on was pretending to be an E-7A Wedgetail)