lol
so much bro science...
you don't gain, you lose weight. promise, true story...
it DOES help with air flow and helps reduce and/or prevent budrot aka powdery mildew...
as most bugs accumulate at tops, thinning actually encourages infestation if you already have a case of the nasties...
as most indoor people are trying to maximize effort, many over veg, and get a major crowding issue. chopping 50% is more necessity than choice.
the extra lower veg stuff can be left at harvest (after chopping all tops and main branches) for two weeks for an additional gain. it isn't a laughable amount...
i'm not saying don't, btw... just saying don't knock it til you try it. wisdom is a culmination of knowledge, experience, and good old fashioned trial and error.
i veg to 3' indoors, i bend and break and mutilate for 8 weeks. then i flower and forget about it. that larf adds up to ounces and ounces of personal leaf, rosin, iso, tincture, salve, butter, etc.
i like the extra half pound of ''shitty'' product per plant. it means i never have to smoke flowers, or cut into the harvest for 'personal' gratification.