I think a big part of this is generational. I can see it by comparing myself (a cusper, in between Gen X and Millenials) to my husband (Gen X) and Millenials.
My husband loves to research the crap out of an idea, reading articles, watching videos, etc. He wants to know all of his options, figure out which way will work best for his setup, and can explain exactly what it will do and why it will work. He likes to become a (temporary) expert on the subject before moving forward. He never lets us buy a fish on impulse; every fish in our tanks is there for a reason and has a purpose. When my husband finally settles on an idea, it can be hard to convince him of another way/option. I literally have to show him my research as to why option B might be better than his option A. But, he does indeed learn from his mistakes and grows, always striving to do better in the hobby.
Millenials will use Google, find someone "reputable" with an answer they like, and often not even consider if this option is the best for them and that there are other options out there. Often times they ignore the evidence or suggestions from those more experienced and just do it how they want, leaving them frustrated with the consequences. Instant gratification is huge with Millenials, and often times they have to learn the hard way that good things come to those that wait (and research!). But, if it weren't for their great enthusiasm and eagerness to have an amazing tank, would our hobby be continually growing and improving?
I get caught somewhere in the middle. My childhood was similar to Gen X, but college/early adulthood I can relate to Millenials. I understand the importance of patience and research, but I sure do like easy answers, and we would have a lot more random fish in our tanks if it were up to me. I have really enjoyed finding R2R and reading EVERYTHING, as it seams to be a good fit for me. It has articles by the pros for when I want to dig deep, quick answers for when that's all I am looking for, and a vast array of people to listen/talk to. Where the Millenial will often stop with a simple Google search, I will take that to the next step, finding several options/opinions before I make my decision, but not spend half the night like my husband learning every single thing about my choice that I possibly can. I, like my husband, might find the best option for our setup, but like many Millenials can't exactly explain why it is best and how it will work.
I do, however, feel blessed to be a cusper, straddling both of these two very different generations. I get the best of both worlds!
And yes, I know that not all Gen Xers are good with taking their time/doing the research, and not all Millenials jump the gun. Many Gen Xers have the money to throw at projects that might fail, building huge, flashy tanks almost instantly. And many Millenials are so engrossed in this hobby that they are quickly becoming the experts. We all have something to learn from each other, and thank goodness for that!
These are just the ramblings of a reefer's wife who has gotten sucked into this beautiful world.