I've been working my way through a great scholarly article that mentions this. I'm not a scientist, and probably barely understand much of it, but the plant's needs determine stage. Not the wills and wants of growers. What one person or another considers is not the proper way to approach this. Due to its illegal past, the science stopped and the bro-grow folks swear by this and that. If you want cannabis to lose the "under the dark of night" feeling it has, we need to get out of the habit of "but I've grown a hundred years and always called it so-n-so". There is sound reason to label and delineate the stages. Scientific reasons.
Till they get the internal signal to grow leaves with the right number of lobes (often 7) certain lights cause one thing, but in the next stage may be detrimental. Certain temps, humidity and root development occur in the different stages, we need to be able to say a word, like veg stage, and all accept the scientific definitions, no matter what we like to call it. For instance, if I asked about red and low red and purpose in veg, the set of conditions for after those leaves appear and before are different, and newly being researched in science using the delineations established by science, not what you call it. In Metter GA, we call a large mouth bass a trout, let me tell you, it doesn't work well! (Other things besides light, but that is just one specific they have actually got peer reviewed cannabis studies on.).
I'm all for each person doing any thing that they want, but the problem arises when groups want to discuss something but have to spend the first 20 pages establishing what joe grower wants to name a stage, then the next community uses some other word and, 20 more pages on that. Communication relies on words having meanings, not each person assigning their own meaning. Growers will always be considered just playing around if they don't at least get the words right.