You will have a good understanding of a system which is 20 times smaller in size/features.
For a todo app that is fine. But for most projects your competitor will leave you in the dust with the speed at which they add features.
Same story, 25 years ago:
> But with Lisp our development cycle was so fast that we could sometimes duplicate a new feature within a day or two of a competitor announcing it in a press release. By the time journalists covering the press release got round to calling us, we would have the new feature too.