No one is talking about a
guru for any one narrowly-defined diet. or
quasi-religious belief or commercial interest in one or another of the many fad diets other than you.
The consensus has certainly changed in nutrition, take a look at the USDA 2016 guidelines.
Except percentage of calories is not the best way to gage the effect of protein. It's complicated. It's the amount of protein beyond what your body can use that can cause issues. If you're active and eating relatively low calories you can eat a higher percentage of calories from protein. But if you're not active and are eating a high calorie diet, a relatively low percentage of protein could be unhealthy.
As far as I am aware, absolute protein requirement, increases fairly linearly with energy expenditure, or equivalently, with total energy requirements. Therefore, your protein requirement as a percentage of total energy requirement remains fairly constant as you vary your amount of physical activity.