[ssijak]

"It isn't at all important in small one man projects since most of your defined types are in your head in any case."

Yes, today. Not in 7 days, let alone 3 months.

[hakanderyal]

And if you are working on multiple projects as a freelancer, the brain capacity it occupies seriously hampers productivity.

We are creating software to make people more productive, but when it comes to our own productivity many of us interestingly shy away from using software (types, in this case) to enhance our own.

I did this mistake for years. Cost me dearly.