I don't think many new hobbyist ask many questions and just learn by making mistakes. Most do so with the mistaken thought that a LFS knows what they need and wouldn't just sale them anything. But no they will sale you anything and do. I have seen so many bad set ups that stores have sold hobbyist through out the years. An manufacturers that will make anything and say anything to sale their wares. I have seen many go out of business and new ones come up behind them.
I try out new equipment all the time and many don't pass my test of fool proof success. Many people will not tell hobbyist all the issues with equipment as this will hurt a sale but it doesn't make a long term hobbyist out of buyer of said equipment just an ex marine aquarium hobbyist.