I don't want to start a debate or anything but Kelly & Lila said
a doula cant turn around to a midwife and say 'dont tell her how she's progressing she doesnt want to know' as it creates tension, but I agree encouraging your partner to is a good idea.
If this is the case ,then what are the parents to be paying for? I thought a Doula was there to advocate the labouring mothers wishes. To be the voice of these wishes when she can't. To stand the ground & be the one who speaks up when Mum & Dad are preoccupied or not in the right frame of mind.
Not to just sit there & say nothing when things are clearly not going to the birth plan.

I realise that not everything will go to plan but something simple like nnot being told about how one is progressing isn't hard to step up & say NO, she would not like to know.

I would be mighty ****ed off if it was me & everyone ignored my birth plan, including my doula.

eta - also whats the difference between the doula creating tension or the partner?
I remember DH standing up for me while in labour with Glenn & the midwife treated him like crap. He felt belittled & made to feel stupid. Personally I would much rather my partner have just as positive an experience as I want. So again, this is where I thought it was the doula's paid job to be the voice.