Tough question for more experianced outdoorsmen

I agree with what you are saying about when to plant outdoors, if you want a monster plant. Also, I know that there are growers who grow at 24hrs continuously, during veg, but switch to 12/12 to induce flowering.
I guess what threw me for a loop was the statement that after June 21/22 the plant senses the change in light, and begins finishing. In my experience, there has been another 2 or so months of vegging, before flowering begins. Approaching the autumnal equinox, there is a minimal light threshold that is crossed. I believe this is what the plant responds to, not a gradual reduction in total daylight, but a total light period low enough to trigger flowering.
If merely a plant's sensing a reduction in daily light triggers flowering, an indoor grower incorporating a 24hr light schedule should be able to trigger flowering by reducing the light to 18/6. This 6 hour daily change in available light is a much greater difference than the appx 3 hour change from summer solstice (example 6am to 9PM), to autumnal equinox (7AM to 7PM).
As far as indoor plants being more sensitive to disturbances in light cycle, I understand that also, but I don't know how that statement applies to this discussion. It would seem to me that it should support what you are saying, but does not. An indoor switch from 24hrs on, to 18/6, will not trigger flowering, the plant remains in veg.

I think we're dancing here...

As for June 21st... I should have written, "it begins the finish process". Better?

I don't know that much about indoor since I never mess with it. I'm sure many variables go into the differences between indoor/outdoor, but the grows are so completely different as to not warrant comparison.

This isn't rocket science and outdoor weed (which is an annual) is like any other plant in that it is synched up to the seasons. In the end it's a two part grow. Veg in the front and bud on the back with the summer solstice as the divider between the two. Does it all happen precisely? No. There's a bit of sloshing around because nature is basically lazy and likes to hedge its bets.

But as the OP first wrote, what's the best way to get a bigger yield outdoors, my system works and works well. I always try to follow the plants rhythm which is another reason I don't grow indoors. Indoors is an abortion for the plant.

P.S. It is important to match your strain with your goals.

So, in conclusion is it safe to say that vegging in earliest growing conditions the best way to go???

My vote, is Yay

Yay or Nay everyone?

But i believe my friends theory is smashed.

With outdoor grows, following the plants rhythms is the way to go. If you want a MONSTER plant, then match the strain up ( a long finish is what you are after) to your area. Not all weed is the same. Pick a strain that is capable of attaining big proportions. Plant as soon as you can get away with it and you will be well on your way to that prized monster.

the most important determining factor is what paralell ur @ im around 30 - 35 deg north.i put my plants out as early as Feb over here. i sumtimes end up with 8 foot monsters.

like this one

this is just a piece of a side brach. of my milkyway (molokai x cali indica x billberry x hawaiian punch) !!!

this is a couple seasons before, right before thins started flowering.

I would say put them out now, get them going the difference will be minimal...I always wait until at least the first week of June here in New England, we just had another frost May 31st.
I believe some strains may finish for you a week earlier if you wait until after June 22nd to plant, because they will not spend time adjusting to the increased light hours just to turn around and have the light hours diminish, but I have still gotten incredible yields even planting as late as first week of July....I guess a lot of it depends on all the other growing conditions.

Good to see another fellow New Englander here. I started my outdoor crop of 2 Northern Lights and 2 Swiss Cheese plants on May 9. That makes them about a month old. I will post the pics soon, but they are about 8 inches tall with 7 sets of leaves now. Growing beautifully. They're really starting to take off now. So what we're saying is that after June 22nd, they will start to flower, due to the decrease in light? I don't think my plants will be big enough to start flowering.

It varies according to the strain, but generally it takes awhile for the switch. Outdoor plants are a bit more lazy. They are also more complete as a plant than indoors.

Is that why outdoor plants take so much longer to grow as compared to indoor plants?

Yes and no. Every day of indoor vegging is about 2 days outdoors. Indoor strains are usually bred to be short seasoned as well. It's a combination. Basically indoor plants are stoked up and pushed to their breaking point. One of the reasons I will never do indoors. I respect the plant too much to turn it into a meat factory.