Plucking leaves throughout veg actually boosts your plants immune system and makes it stronger. This is something really good growers have known for a long time-strategically stressing your plant makes is stronger and more vigorous. There are also methods of stressing your plant to boost resin production, promote side brancing, bring out color, etc.
If you train your plants I'm not sure how you would avoid removing leaves-i tuck everything I can but it gets to a point that leaves have to go.
If leaves are overlapping and creating wet spots then they have to go, IMO.
Does anyone do scrog and not remove ANY leaves?