Not really worth the effort to go through and make a special exception to 'masks' or things like that, most of the messages are automated based on rarity class or other various things. System messages help serve as a log as well. Sometimes special/valuable prims are added to giveaways, and people want to see who obtained it once it drops. There's not really a simple automated way to determine which would be valuable and not without a manual list/whitelist/blacklist, so I can't(more like don't want to) make case specific ones, that's just not worth the time/effort over it being very mildly annoying to see a system message show up.
I like to use them as public logs for certain types of things so I can keep track without having to manually make a system to keep track of something, it's nice and way more convenient to look through shoutbox or system channel in discord for me personally, than my personal logs.
I like to use them as public logs for certain types of things so I can keep track without having to manually make a system to keep track of something, it's nice and way more convenient to look through shoutbox or system channel in discord for me personally, than my personal logs.