went back and re-read the chapter. I have no complaints with her waiting... but yes I agree it is tactically unsound.
Understand that 4 fully trained men who've seen combat will very likely overwhelm one person with a gun. There are people today (eg Krav Maga martial artists) who can who can disarm you bare-handed from across a room. Imagine squaring off with four of them. Queen would have no chance. And we haven't considered one of them might be good at eyeshots with a thrown knife. Or have a razor-drone to bounce around the room at the speed of sound (killing everyone including the suicide attackers. Or have a poisonous gas sac implanted in his rectum. Or use ultrasonics to knock everyone out. Or even something as simple as a burning smoke grenade using a frozen cube of hydrochloric acid ancasing a ball of phosphorous.
Basically, "There's no way she could have taken them all down with a blaster before they charged" is the point I should debate. It should probably be "There's no way she could have taken them down once two had fully entered the room". She's unwise to allow them to enter. Given the multitude of ways the killers have at their disposal and that she can't be certain if htey plan to use them, she does indeed risk her son's life in order to enter into discussion with them.
No issue with the current structure IMO. But I can see the other side of the equation the reviewers are trying to convey.
You'll laugh at my suggested fix, but after that, perhaps give it a thought. Jospeh is of military training in this draft... how's about they take him and his mother alone* as they flee down a hall. Joseph turns around and lets them have it, disarming two (the hallway can serve to string out the attackers so they can't all fire) by breaking joints jiu jitsu style. The last two overwhelm him and your scene progresses as normal, only everyone his holding live weaspons and it boils down to two on two.
Basically, I'm suggesting remove the part where the villains are unarmed and let your MCs carry their weight (sink or swim).
*I would have them separate the king and the queen the moment an attack is ascertained with the goal of reducing characters in the scene