"We", Kemo Sabe?
I'd say well more than half of the high reliability ICs I've
designed, have been on bipolar technologies.
You can break either one, but MOSFETs have classes of
reliability problems (oxide wearout, hot carrier, NBTI) in
-normal- operation that BJTs simply don't. Vertical BJTs,
anyway - laterals are exposed to a lot of low quality
oxide over the base. And yet outside of some abnormal
environments, even these seem to do fine on a lot of
parts that have been on the job for many decades.
To paraphrase Bob Marley, "no thin ox, no cry".