One for all also limits individual functions. I have been missing the kind of discussion I had been relying on for almost 30 years. It was a habit before the Web became so developed to find special interest email lists in order to have discussions with experts or dedicated amateurs on any subject that I was researching or curious about. Then suddenly, it doesn't work. I discovered that many people are now relying solely on their phones to check email. Phones do a lot of stuff but thinking while using them is still limited. Typing a two-word reply is just the easiest — or an "agree". No analysis. That's when I realized that email lists were doomed.