I agree in theory. Having seen terrible mixes of tabs and spaces, I don't agree in practice. I've worked with several projects that painfully switched from tab

I agree in theory. Having seen terrible mixes of tabs and spaces, I don't agree in practice. I've worked with several projects that painfully switched from tabs to spaces because tabs didn't work for them in practice, in a setting where several people work on one thing. I haven't seen projects go the other way. (Yes, automated formatting would solve part of thise.)