Because it’s fun to create things like this in very little time. Some people wake up and play wordle in the morning, I like to spend 15 minutes making something fun and dumb with v0 or lovable.
Don't underestimate the value of having fun in life.
Also, the truth is that I've learnt and got productive with dozens of programming languages already. That's not a challenge, it's tedious. Figuring out how to be ultra productive with AI is a much more exciting challenge. More novel and and more valuable.