Your grandparents lived in an era where it was common for men to build their own homes.
Your parents lived in an era where it was inconceivable for a piece of furniture to not come fully assembled in their per-fabricated home.
We now live in an era where homes are made in mass scale and we assemble our own furniture. Did I make an IKEA table? I don't know. I paid for it, drove it home, and assembled the machined parts and added the same size Allen key to my collection. It's certainly not a table without my contribution. But I couldn't have built it myself from scratch.
I now tell the computer with the magic words please and thank you because I skimmed a research paper saying it'll be more cooperative in completing my tasks.
Did I make a game in unity where I just mishmoshed the preassembled assets together? I don't know. The only difference between IKEA furniture and my game is the permutations of my asset combinations, really.