Yea it's weird for me too, sometime they seem to stall out a few weeks after this, but every time I flip them into bloom, they just go crazy with a stretch, but it's all for growing bud. I get scared but I end up with no regrets. It makes the end trimming easier too .
You could always do a couple plants next time on a side by side comparison, some manifolded and some not. I end up seeing benefits to manifolding every time, but it takes a long time for my confidence to catch up. Patience.
Cheers