There are various types of talents. He's obviously very talented at design (not necessarily only UI design but general program structure and framework design).

There are various types of talents. He's obviously very talented at design (not necessarily only UI design but general program structure and framework design). But if you needed someone to write packet routing algorithms or design a high-availability database engine from scratch, that may not be his cup of tea. OTOH, I bet there are developers who love brain teasers and puzzles who may very well excel at that type of work but couldn't implement a huge software system with many moving parts without having it collapse under its weight.