I can see both stand points on defoliating, there definantly is a fine line a mid-max ratio persay. its a wonderful learning opportunity for sure! From my observation and research it's hard to generalize due strain personalities/adaptations. There are general guildelines you can use for reference, I've watched countless videos and read so many treads on afn...
It helps that I have a local growing buddy, we bounce ideas off each other.
@jelly0 here has caught so many mistakes I've made lol...
I find that these practices yielded the best results for me. If I learn of better methods I'll let ya know buddie!
*1st defoliation - after the plant shows sex and is about to enter preflower (multiple pistels start to develop on tops early signs of stretching)
*2nd defoliation (optional) - full flowering stage 4 weeks before flushing (I factor depth and spacing of bud sites, I remove obvious popcorn sites that get no light.
*defoliating starting from top to bottom - count from top of budsite down, anuthing below 3rd note is free game
*defoliating starting from bottom to top - any leaves that sag and are able to touch the medium and obvious popcorn bud sites that get zero light are free game.
*I defoliate in waves - i don't defoli all at once with autos, I think it's to much stress. For photos on the other hand, I do it all at once.