Thanks for your interest. I have yet to plant corn, okra, and cow peas (all of which are to be planted in raised rows) for this spring but like you, all else is planted in both my containers and regular garden.
There is something about the environment provided by these containers...possibly consistent moisture...that transplanting is not needed...even for the difficult to germinate carrots.
These are my spring carrots. Direct seeded and thinned once. The only problem is too much germination...as they have to be thinned several times.
All the veggies grown in the experiment were direct seeded except for brassicas which were transplants. I like Bonnie's Green Magic broccoli and their cabbage so I transplant those but have no doubt that direct seeded would work in the containers even started in August. Again, like carrots thinning out would be very necessary.