on a serious note - training lighter develops muscle a lot better for tons of people.
I have trained back in the garage with deadlifts and BB rows for years, and never really had anything impressive.
I joined a "fitness center" about 4 months back, and have been training on all sorts of iso-lat machines, hammer strength, lat pulldown bars, weird cable rows...
and for the first time in my life, I have upper lat 'wings' that show from the front. Sorta like the ones that stand out on Chris mason, albeit mine are a mite bit smaller. But the machines, and relatively light work on them compared with 350 lb tugs in the garage on deadlifts, have made a difference.