On the no watering issue, I think there's an assumption that you have good tilth in your soil which will hold the water and allow the roots to go deep. Not everyone is this lucky. Clay soil is very difficult for young roots to penetrate so they need a bit of watering at first to give them a chance and then you can ease off watering. Sandy soils have their own problems. You can't tar every garden with the same lack of watering can/hose. Particularly if you've inherited a plot that was previously well tended for many years.
As for not earthing up potatoes, it seems no matter how deep I plant my potatoes, they still like to grow upward and pop out of the soil. I prefer to live, so yes, I hill them up. Not a task I love to do but necessary if I expect edible potatoes. Also, some varieties continue to put out new spuds all along their growing stalk so there's no alternative but to continue to earth up.
In my warmer summer climate I have no need to chit sweetcorn, but a lot of UKrs find it necessary in many cooler areas in order to get an edible harvest. Again, your area's climate is not everyone elses so generalizations in chit or not chit really are invalid.
Weeding is a must in allotments. Period. Unless you really want to be kicked out. Weeding in my home garden is necessary because I know for a fact that my yield is superior when I do weed (non competition from hardier weed roots) than if I don't. I grow to feed my family, not play at gardening when the mood strikes me. I'm always amazed at just how many types of weed seeds blow into my garden and try to take over. I constantly battle bindweed which would strangle the whole garden within a month if left unchecked. Glyphosphate is only a partial answer and its cost can quickly add up if done rather than simple hoeing or digging out of roots.