My Janome 9000 has the bobbin indicator and I love it. It will continue to sew but give you a message on the screen every so often. If I run out, it's my own fault because by then, I've had at least 3 warnings.
I used a friend's Bernina over the weekend and she didn't have a bobbin indicator on it. I ran out of bobbin thread twice! Now I know that's a feature I can't live without.
OK, I just put the umbrella up ... you can spit now. :D