How is it possible to raid without retreat ability?

[Zarix]

The whole retreat thing is very complicated. For example if a fleets retreats do they end up in the same sector or is the fleet disbanded?

Besides, isn't the simultaneos turns supposed to work so that if an attacker can catch the defending ship the attacker has to be faster or their paths has to cross so that the defender has to make a big turn to escape. In reality the attacker would get very close to the defender and that applies to both cases.

I don't think that adding retreat to SE4 is a good idea.