Sorry if this sounds rough, computer science is probably only about combination, but there are many other fields
Saying that is like saying everything is about combination because well, it is even the creative stuff if you are pedantic.
The wibbily wobbly dna of humans is how we keep recombining things into new shit. Comp sci absolutely has deep creativity in it.
There is absolutely no DNA recombination during a thought process.
It’s well known that many people think all art is merely copy of a copy, so I’d be curious what field you’re thinking about