The protein landscape is continually changing as science advances and trends change. Consequently, recommendations for protein intake are regularly being updated and refined.
If muscle hypertrophy (growth) is the goal, current recommendations for average daily protein intakes are insufficient. To maximise muscle growth, muscle protein synthesis (MPS) has to be stimulated post strength exercise and at regular intervals throughout the day. The source, pattern and timing of protein intake all need to be considered to maximise growth.
Find examples of food portions containing ~20g protein here: