Can't there can be over-current issues if you are not using a dedicated wall outlet for backfeeding the solar?

Consider a situation where the plugged-in solar inverter is capable of providing 15 amps into the circuit, but so is the breaker feeding the circuit from the panel. If you plug in something that can consume 30 amps, it will be able to do so by pulling 15 amps from each source without tripping the breaker, so you can end up with 30 amps traveling in your building wiring that is only sized for 15.

At least that's how I understand it. I don't know if any of the grid-tied inverters that can plug into a wall have some way of detecting and compensating for this. Clearly other countries have been able to come to a decision to allow it. I vaguely remember someone explaining that the 230V systems in Europe somehow mitigate the issue but I don't remember how.