The same rule applies to phone apps as to work email and meetings: the usefulness to you is likely proportional to the time/effort spent by the sender devoted s

The same rule applies to phone apps as to work email and meetings: the usefulness to you is likely proportional to the time/effort spent by the sender devoted specifically to you. Heuristically, it's inversely proportional to the number of recipients/participants. So in messaging apps like Whatsapp I silence all notifications to groups (but not 1 on 1), and for email I read the contents of those addressed to me personally, but for dept/company wide email usually just the subject line.