Remember this little snippet of dialog said by Bishop?
"It is impossible for me to harm, or by omission of action allow to be harmed, a human being."
That establishes that synthetics, at least Gen 2s follow the standard principles of Asimov's laws of robotics, which makes no sense why the Synthetic cannot do suicidal actions to save human beings (or why they don't), such as what Bishop does several times throughout the film in Aliens. It should be forced and encouraged that they value the lives of humans over their own.
Survivor synthetic expands this problem even further, adding a role which can both be neutral to aliens and directly hostile if the marines threaten its existence, however, this could make sense given that they were a colonial synthetic programmed by "Weston-Yamada" to secure the sample that the colony discovered, whatever be the case, it seems extremely stupid to have this role be the "Yeah I support everyone, but I can't work against the marines, oh except if they threaten my existence", instead of trying to de-escalate the situation like an actual Synthetic would, we have aspies going around as synths directly antagonizing people, trivializing roleplay and the programming doesn't stop that in the slightest. It's immersion shattering to see synthetics acting like this, survivor or not.
Oh and fucking remove whatever code prevents synthetics (and their torso's) from being gibbed just because you don't want permadeath for synthetics, if they're getting ripped apart by the queen they should NOT be able to be repaired, that's just extremely dumb.