New meta-analysis says 1.5 g/kg protein is enough to maximize strength development 
One of my first articles was about the myth of 1 gram protein per pound of bodyweight. I argued 0.82 g/lb was more than enough to optimize our gains based on the research, in contrast to virtually every other source in fitness at the time.
This article stood the test of time extremely well. In 2017, I participated in a meta-analysis of the literature that found 1.6 g/kg/d was the break-off point of further benefits in gains.
Now a new meta-analysis concludes 1.5 g/kg/d is already enough. "Concurrent use of resistance training is essential for protein supplementation to improve muscle strength.
This study indicates that 1.5 g/kg BW/d may be the most appropriate amount of total protein intake for maintaining and augmenting muscle strength along with resistance training."
These numbers are all for total bodyweight, which is what most researchers use. There is no research that basing protein requirements on lean body mass is more accurate, in particular because it's hard to know someone's body fat percentage with high certainty.
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