X2Hmmm, really? I find my plants take much more water in flower and I give them everything they want (well not really because they drain the reservoir in my SIP on a daily basis and I fill it daily, but it's never enough...).
I'd agree that watering is one of the biggest challenges for new growers to get right. That's why I like the SIP. Perfect watering every time since the plant waters itself. And the built in air gap ensures that there is always oxygen to the lower roots which allow us to run with a wetter environment in veg.
Im in soil, come flower they average 2-2.5 gal every 2 days in 5gal fabric pots. Watered in stages, about .25gal at a time, then start over. I feel like I'm water boarding them. But come last 2 weeks of flower I've noticed they only take what they want. Then I push them to drought hard 4-5days.