It’s not even really an issue with DC either, like a lot of people’s battery systems have multiple DC loads and multiple sources (e.g. DC MPPT solar controllers) going to a busbar connected directly to the battery.
Current load pulls the voltage down, sourcing current pushes it up. No bother, as long as your sources cut out if the voltage goes too high, and your loads cut out if it goes too low.
Current load pulls the voltage down, sourcing current pushes it up. No bother, as long as your sources cut out if the voltage goes too high, and your loads cut out if it goes too low.