What role does recovery play in muscle growth?
Training creates the signal. Recovery lets you adapt to it. Muscle growth requires enough stimulus, but also enough sleep, food, time, and stress management to turn the stimulus into progress.
Poor recovery can make a good program look bad. Performance falls, soreness lingers, motivation drops, and the same volume becomes more difficult to absorb. More training is not always the answer.
Use recovery feedback to adjust the plan. If you are progressing and feel ready enough, keep going. If fatigue is accumulating faster than performance, reduce stress, deload, eat more, sleep more, or lower volume.