Yeah the topic comes up from time to time, mayhaps mostly on Discord. We've seen what happens when they get unlocked from the basis of other servers and that's not the direction we'd like to proceed. Furthermore, in the particular case of the mentioned weapons like LK38, Master Raven and Snow Queen, these weapons actually do see use in the current meta. Specifically, Snow Queen is not at all a worse weapon than Frozen Shooter having the ability to pierce, giving it a strong utility when positioned well.
The thing is we've basically solved PSO (albeit still growing). Charge Vulcans are strong for how easy to get they are but they aren't always the efficient choice on an endgame build, and that's because we've optimized on how much damage and accuracy you theoretically need to actually kill something as opposed to overkilling something, meaning overall, the DPS isn't actually the highest from having the easily accessible weapons. They're still useful of course, but they just have their own lil' place in use-cases.
Ultimately I think it should stay as it is, as that's the intent of the server. There are some combo-locked weapons I'm kind of iffy about though, mainly the FO ones.