Honestly its a double edged sword here. Doom has so many built in convenience functions like `set-font!` and `set-repl!` that an experienced elisp programmer would probably love it for building their own configuration.
On the other hand it bundles so much that an inexperienced emacs user might be more keen to do the bare minimum and rely on the packages bundled with doom to give them all the cool stuff without much effort. After all, why "reinvent the wheel"? I personally don't agree with that sentiment, I think learning how to build and maintain a personal emacs config makes a person a better programmer generally, and makes them prone to reading and writing documentation rather than copying solutions.
I started off with doom and even though I don't use it anymore I still find myself reading its source to figure out how Henrik approached a solution. Love it or hate it, Doom is great in both very good and bad ways for emacs users.