Hi John,
For OEI - until one has a goodly speed margin and terrain is no longer a concern - more than 15 degrees is, in this ops engineer's view .. a tad silly.
It depends. I would agree if the aircraft was flying below the min maneuver speed for the configuration. However some places such as Ajaccio (LFKJ/AJA) departing RWY 02 require a bank angle of 20° and a maximum speed of 158 kts during the early Left turn - and terrain is definitely a concern.