I feel like the process is broken in a looooooooooot of ways, but I can't feel that a low % of job offers relative to the # of interviews is necessarily a sign of brokenness?
For most software development jobs, I feel that collaboration is important and those sorts of interviews, when done well, are probably one of the least-terrible ways to get a feel for it.
Of course, there are also plenty of cases when this sort of interview is not ideal. Not all development jobs require collaboration. And there are brilliant developers who just don't interview well. Etc.
In the end, though, you won. Entrepreneurship is tough but ultimately I love it more than working for others. It's your life, why work for others if you can help it?
For most software development jobs, I feel that collaboration is important and those sorts of interviews, when done well, are probably one of the least-terrible ways to get a feel for it.
Of course, there are also plenty of cases when this sort of interview is not ideal. Not all development jobs require collaboration. And there are brilliant developers who just don't interview well. Etc.
In the end, though, you won. Entrepreneurship is tough but ultimately I love it more than working for others. It's your life, why work for others if you can help it?