Indeed. When I mentor new lead climbers/belayers, I point out that lead belaying should feel about as stressful as lead climbing. If it doesn’t, you’re not paying attention.

Sure, but any safety paradigm that begins and ends with "(people) should/n't x" is a bad safety paradigm across anything enough people do enough of. It's probably easier to compensate for weight differences with a tether or weights than to convince people to spend long periods of time on high alert with low chance of incident.