It was interesting to see this totally-unrelated-to-our-times process from the outside.
From our place in time, container shipping is obvious.
At the time, to people who wanted to ship something, it was ridiculously hard and expensive and risky.
If you were shipping something from cleveland to paris, you might just give up.
Say you were shipping alcohol - only part might arrive, the rest would disappear.
The shipping industry had all KINDS of forces at work to keep the status quo. trucking companies, trains, shipping companies, freight forwarders, longshoremen, stevedores, unions, people with older non-container boats, etc.
and they didn't want standards.