I tend to agree that people try to over think this more then they should, myself included to begin with.

Now on my third grow I've learned some lessons and I'm still learning. My current potting soil mix should have had more sphagnum moss mixed in to retain more water, on these hot days I'm watering every single day and the soil is not retaining enough water. I can probably make it one full day but I wouldn't push my luck beyond that. I have trays under most of my containters now so that should help. I think I've been underfeeding my plants but after killing 6 nearly finished plants once I'm extra cautious.

For starters I absolutely agree they should keep it as simple as possible.