Even back to the mid-90's I've always approached projects like this -- soup to nuts, all the way from idea to conception to creative ideation to implementation to digital life!
I also used to assume everybody did lol, until I worked long enough professionally to watch the landscape subdivide like a fractal into what we have now.
There's a LOT of bad shit to be said about AI coding, but I also have this feeling that something about it all is rekindling that ancient one-man-band approach that can actually work if you're able to play all the instruments. Really interested to see what comes of it once the breathless hype dies down a little bit.