Well, I don't know what to say aside from we would need a lot of work to have it 'both ways'.
By that I mean, if we expect everyone to charge their cars during the day, especially 'peak hours' in a given industrial area, there's a chance that the line and/or station capacity would have to be increased. A large part of the allure of 'night charging' is that it avoids requiring major grid upgrades, and also possibly opens up better uses around certain energy sources quirks. Nuclear, water power, geothermal, all three to some extent have 'consistent load' properties where either it takes time to adjust power output, or power output can be consistent both day and night with minimal incremental cost, vs the need to install additional capacity for extra day load.