Honestly i think all synths should come with atleast a dustcover, and preferebly a transport case of sorts as well. Both custom made for the synth. The dustcover is dirt-cheap to make and wouldn't be an issue to include. And the transport case might increase cost slightly, but the regular boxing and shipping stuff could be saved on then, since it would be better protected during shipping. Then as a customer you'd have a useful flightcase instead of a cardboardbox.
Seeing as you can buy cases from around 40€, it should be possible for companies like Arturia, Korg and all the others to include one for even less without losing money on it. Obviously they'd just use it as another place to earn more money. But imho there's money to be earned if you think about those little things that make the customers happier.
And sadly it can be tricky to source these things for synths like the MiniBrute because it has an atypical shape/size.