... and who is going to tell someone that when they've socially isolated themselves by taking time off for an extended period?

The only time I've seen a therapist more often than weekly or bi-weekly was in a short stint in rehab. No way, no how, does normal therapy replace daily contact with others.

Also, most people aren't assertive, informed, or motivated enough to seek a second professional opinion, and that's before we throw grief into the equation. Congrats on describing all-too-many therapists with your last line as well.