As someone who, unfortunately, wasted an unhealthy amount of time in "productivity hacks", a much needed realisation that came to me was that the only system that works is the one that you own. I'm going to equate this with my (failed) attempts at trying to make Neovim my go-to standard for all things code.
The promise of Neovim and GTM, Zettelkasten etc note taking systems is that they will boost your productivity/workflows, however they might be. Something like Neovim or "second brains" can only work if you're able to find the value that it offers you, otherwise for the most part it would just be a cool bragging point; "I use vim btw".
All systems of this nature are only going to be of service to you after they are modified, tinkered with and/or tailored to your liking. Instead of starting from scratch, you can pick up Lazyvim (or other starter templates) and get going with those but the "productivity boost" will only happen when you get down in the trenches deep enough to understand how this system can help and vice versa. This is the same exact thing for these glorified productivity hacks from gurus.
I've tried setting up different kinds of systems for my Obsidian vault too and they have failed spectacularly only because they were systems that I never owned and therefore never was able to utilise them. The benefit actually became apparent once I created my own. However crude it was (and still is), I am able to extract value out of it because I know how it works and thus, it serves me well.
Steph Ango (CEO of Obsidian) has a detailed blog post about how he uses Obsidian as well. But I can guarantee you that if you copy and paste his Vault directly, it will have none of the "10x boost" that the gurus will have you believe. It might but only after you come out of the trenches.
The way that these productivity hacks are being sold, I have a feeling we might just get a $19.99 Udemy course on "How to take notes like a pro".