Not my perspective the film manufacturers proposed 220 in the hopes of selling more film at a higher margin.
Less packaging ie less than 50% packaging so even at twice the price more profit.
In UK only high volume stockists shelved it in '90s, 120 was higher volume, by 2005 it was mail order only.
It is because the finishing process (sourcing and adding leaders and trailers) has become problematic.
? They could have used a guillotine on 120
The machines used for the purpose are special purpose, very expensive, and in the case of Ilford, worn out beyond economic repair or replacement.
Rusting from lack of use maybe?
And the supplier of the special purpose paper (reputedly just one left in the world) has immense minimum purchase requirements.
When volumes were high, 220 made sense to the manufacturers.
When volumes did not materialise the manufactures will have had difficulty getting resellers to buy it without selling it cheaper than two 120.
Only Fuji's c41 and E6 volume will have had a good margin for Fuji.
No different from Kodachrome or 127.
Use more 120 or buy a bigger fridge.