Pawn Promotions

I'm curious as to why one would wish to promote a pawn to a bishop or
a rook. It's obvious why in some instances a knight would be desired,
but is there any reason not to promote to queen in every other
instance?

If promoting the pawn to a Queen would create a stalemate would be
one situation.

Rhymester

conservation of power - some player might think If I can end this with
a Rook or Bishop I will show more flair/expertiese than with a queen.
AKA if I can kill my opponent with a Rifle instead of a Nuke in the
same # of moves, which is more elegant?

Where promotion to Queen might cause a stalemate but promotion to
a rook, for example, avoid the stalemate and provide enough
material to win the game.
Try something like Black B on f6,Black K on f4, Black P on g2 and
White K on h3 with black to move.
FEN
8/8/5b2/8/5k2/7K/6p1/8 b - - 0 1
Granted, the mate is actually shorter without an immediate promotion
but for those who cannot visualize 4 or more moves ahead, the
promotion is more intuitive.

chessterbation - If you can mate your opponent by the actual promotion of the pawn, then it always
looks cool to do it with just a bishop or something - It also leaves the other player going grrrrrr....!