What I think is interesting is how "many" good young "kids" are rolled out all the time now it seems, and they all look the same. What I think is the reason is that the blueprint is now available to all. Back in the day you had people searching for the secret, doing haphazard "cycles" that didn't amount to much, now it's standardized:
GH from the very start, no waiting around
Insulin from the start
No "cycles." When you get on you stay on, no yo-yoing doing cycles to get healthy between them by going off for the most part. If a stack is hazardous to health, change compounds, don't come off. The exception to this is precontest and then switching to off-season. The prep and compounds can be quite toxic so you need a wash-out period after shows, it's prudent. But you don't get off, you stay on the test and GH, you just lay off the heavy tren and orals
Cycles built around testosterone. Escalate test and anabolic doses as progress continues until you are at a couple grams of T plus a couple grams of anabolics
Hammer tren and orals close to contests to get the standardized finish you need to place and which almost everyone now has. Ripped glutes are a must and almost everyone has them. You can joke around it, saying how gay it is, but it's simply a gauge to see if you are mostly ready and it works great
Train hard using a "bro split" or a "push, pull, legs split." No mystique, no balonie for the most part
Always stay lean off-season. No debating if you should bulk hard and get a little fat or whatever, this is the way to go (can be debated but this is the line of reasoning for most today)
I think this is great in that no one has to search for the secret now, the standardized blueprint is the above. You have a guy with ok-good-great genetics and he has the "pro" physique in short order following the plan
Many oldtimers probably cry about the lack of mystique nowadays and the lack of wildly different training philosophies, it was fun playing around with different things like in the past...
But it is what it is. No secrets.

EDIT: you don't really need a coach, what you need to "know" fits on a piece of paper. What you need is the above with maybe another sheet or two of less important details. Of course you need to learn the exercises and need to learn to cook lol, but that's about it. Every coach nowadays works the above pretty much, not much difference between them.