I have filters set up. But that's treating the symptom; it requires constant maintenance of the filters because people keep adding more lists, or some manager decides to change the name of the list because they re-branded some internal team name, or whatever. It's just noise. It's work to deal with it. Reducing the noise at the source is better than trying to filter it, and filtering it is better than ignoring the entire system, but the end result when it gets bad is that many users ignore the entire system.
It's a lot like phone calls: 90% of incoming calls I get are spam. I no longer answer calls that aren't in my contacts list, I add businesses I interact with to my contact list if I want to get their calls. Everything else goes to voicemail, and my voicemail is "Due to a high volume of automated calls, all numbers not on my contacts list are voicemail only. Please leave a message." Filtered! But also makes the phone pretty useless for initial immediate interaction.
