Canal-based shipping is unworkable.
Evangelos Boulougouris 21, Research Director of the Maritime Transport Unit at NAOME, 4-1-2021, "How Container Ships Got so Big, and Why They're Causing Problems," https://maritime-executive.com/editorials/op-ed-no-need-to-scrap-megamax-boxships-after-suez-canal-grounding
Operating megaships in confined waterways has already been shown to be difficult. Stacking them high with containers doesn’t help: it can lead the vessels to catch the wind and become even harder to control, which may have played a role in the Ever Given’s grounding.
When caught in a storm on open seas, such ships may also be more prone to losing containers overboard. According to recent analysis, at least five of the largest class of container ship lost containers during this year’s winter storm season in the Pacific.
Infrastructure is also struggling to cope with these larger ships. According to a 2015 report, ports, straits and canals require expansion to make way for the new class of megaships. The cost of such projects is immense: the expansion of the Panama Canal in 2016 to accommodate bigger ships ended up costing over $5 billion. In light of these infrastructural concerns, there may be an economic argument against expanding the number or size of megaships in our seas.