Defoliation in first two weeks of flower (stretch), was it a poor decision?

You're fine. There's still tons of leaves, doubt it slows at all. I generally like to do my cleanups just before the switch to 12/12, then a maintenance cleanup 3-4 weeks later- or as needed.

I always end up pruning a lot when they get very bushy and always asking myself if I didn't over do it. It always depends on the time you can give your plant. It will certainly not kill it, but she might need a bit more time to recover fully. People say switching to flowering is stressful, so growers tend to wait till 3rd week to make one big last defoliation. Tldr; it's probably fine, give it all the care you can and she'll be putting those leaves back up very soon

taking off more than 1/3rd of plant can potentially stunt it, but not always. Someplants stretch a ton after flip, and some do not. so, your familiarity and a some educated guessing can help guess as to what happened. did it stop growing? are the nodes too tight at top (this context would be light-related if it stopped vertical growth)? insufficient information to give a single answer here. i regularly prune off a shit ton without any stunting of growth... whether it is mother plants i prun back to lowest growth tip per branch or a heavy removal of lower / weaker growth 10-14 days into flower. Yet to have a problem, but that doesn't mean it won't happen. anecdotes are not good evidence, so take it as a grain of salt. Usually for me if a plant slows vertically it's either just genetics (with normal growth patterns relative to bushy vs lanky phenotype) or my lights needed to be raised an inch or two.