Hmmmmm. I agree to a point. Simplicity is the order of the day for any new grower. But, quality should never be overlooked. Many people have tap water unfit to grow in...I am one of them. My TDS is 1300 right out of the faucet.
As far as medium, of course, keep it simple, but make it something you can replicate if it works well. I advise ALL new growers to start with Sunshine #4 and 30% perlite. Just dumping a bunch of shit in a pot may work great...but can you do it again without knowing the ratios.
Most people use far too many additives. Again, simplicity and quality rule the day here. I have done alot of nute testing this last year. For ease of use, high yields, and great quality, I prefer Advanced Connoiseur+Big Bud+B-52. A new grower could use just the 2 part Connoiseur with outstanding results. Start simple and add from there. I am NOT a fan of Miracle Grow. If that's all I could get that day I think I'd feed with clear water and call that day a flush day before adding it to my plants. That's, of course, with a soiless indoor settup. I'm sure a good dose of it to plants growing outside in the ground gives good results.
Simplicity is great. But you need to now what you did and be able to repeat it if it worked, or avoid it if it didn't. I have grown perfectly healthy beautiful plants that yielded .4 grams/watt. Then, with a change in nutes, the same plants yielded .75 grams per watt. The smaller plants were perfectly healthy, and I could've gone years without knowing there was something better out there. My point is, you can keep it simple and still try new and different things. That's part of the fun of it, right?
Good luck and good growing to you all. I hope the New Year brings bountiful crops and good times to all.