Vegging longer than 3 weeks is pointless and wasteful IMO. 2 weeks preferred if possible with good equipment or when the first 5 point leaves emerge is when the window to flip opens.
I cannot stress the emphasis on good equipment here. If you have top shelf high quality lighting and are well versed in your grow techniques, the less veg time is needed.
The only difference possible about alternating vs aligned nodes is surface area of a flower. The greater the surface area, the more trichs and that equals greater potency. Other than that, alternating nodes are meaningless in the end results and I'm not even sure they create more surface area on a flower.
In regards to size, there again as well, long veg or short veg has no impact on size of flowers. That's genetics.
If anything, there's a just an unknown in growers when it comes to flipping a baby plant if they've never done it.
Like no way will it produce because it must veg and get big if I want a meaningful harvest. That's pretty much dogma today.
We have to look at the bigger picture and understand that growth will happen even if it's not there to see it at the time of flipping.
Instead, we've been growing huge plants only to cut branches away, defol, lollipop and more. All of that is pointless and does nothing to increase yields or potency. Everything the plant needs to put on for the yield will be done in the first two weeks after flip. Potency starts coming on in week 4 of flower. It's a mad rush veg period into flowering even though the lights are at 12/12 that gives them structure and will take a 10" plant at flip into a 4 footer at harvest.
Short veg also takes full advantage of indoor lighting by getting full plant penetration rather than have a canopy then 2-3' of dead space between the canopy and root zone. That's really my biggest issue with long veg and why I'll never try to grow trees indoors again. All that wasted space and growing plants just to cut a lot of that growth out.
Other factors...ez to beat a bug infestation with little to no veg because they don't have the time to take full control and destroy a crop.
Annually is where things really get interesting because by reducing veg time to less than 3 weeks gives us the ability to grow at least one more full size crop per year compared to long vegging of 3 weeks or longer.
So yeah...I woulda flipped your crop yesterday