As you get older, you have to become much pickier which if any wheels to reinvent. As others said reinventing the wheel is fantastic for learning, but not so f

As you get older, you have to become much pickier which if any wheels to reinvent. As others said reinventing the wheel is fantastic for learning, but not so for production / real life stuff. So for example implementing your own transformers from scratch - great for learning but for 99% it would not meaningfully change how you use LLMs for mundane things. So only when the domain is really really meaningful to you, you could consider reinventing the wheel and even then do not expect any immediately payoffs. Those 4000 weeks pass by awfully quickly. You have to pick your battles / wheels.