OP
I completey here what you saying, I think posting on this board does tend to result in more support than others though, and I would encourage you to reach out if you need support but unfortunately there are always people who see the thread in active and then jump all over a stressed out/confused/should have known what I was getting into ha ha ha ha stepmum who uses a word incorrectly, says something that doesn't sit right with a mum who may be having a difficult time with the fact her ex has a new woman in his life. Now that woman is stepping into a "mother" role when her child isn't with her, uses a term someone takes offense too, the day of the week has a Y in it etc etc - because sadly on the whole StepMums can't win.
I think very generally speaking nobody would choose to be a stepmum and don't think anybody would really want a stepmum I also don't think any woman (who is a loving mother) really wants her child to have a stepmum - this, I think, a great deal of the time explains why it is so difficult and why you see the reactions you do from mums on here and in RL.
What really needs to happen is that StepMums need to be allowed to feel what they feel and be honest about it, not judged just helped and supported. Especially by their partners
As a dad my DP (who is the RP so my stepmum role is different from the "norm") can say "these DC are driving me up the bloody wall today, i just want some space, I want to sell them on eBay" and whilst some people may glasp their pearls at the eBay comment most people will think, yup I've been there, the little turnips have been fighting all day, whining etc etc etc. As a stepmum it took me a long time to feel I could say anything like that, as I was worried how I would be judged by my DP, my DSC and felt horrified at myself because I felt I couldn't feel like that. DP had years of getting to know these tiny humans, is only known them in comparison a small amount of time I had years of catching up how could I week into living as a family feel like this! You feel like that because there bloody hard work and when they decide to try and murder each other for the tenth time you want to bash your head against the wall - doesn't mean you hate them, dislike them don't love them you just want to scream
helps 
Women are so hard on themselves no matter their parenting role, but StepMums have it very tough boundaries vary greatly and feeling like a spare part can't be fun at all, it actually hurts to see how many women are vilified on here whilst stepdads who step into roles like mine with a RP are given medals and seen as heroes. I've had all sorts of comments in RL people used to assume DC actual "mother" was dead. The worst was when someone realise she wasn't dead that they immediately thought I was the OW who must have stolen my DP from her and caused her to go all Miss Faversham (didn't steal anybody! Met him after she had flounced off for the second time and hadn't seen DC for nearly two years) somehow was all my fault a man would never get this - hey ho, I don't give a shit anymore
mostly
Do I think it should just be step parents on here?I did at first, under a different username and after a vile bashing that had me in tears I wished it was. I've grown a bit of a thicker skin now, I think it's helped actually I've learnt to stand up for myself against people who don't know me and don't know our family situation. I see a lot of stressed out StepMums (ive seen some very nasty ones who shouldn't be near any children IMO too)
Buy the book step monster it kinda helps, don't give up on this thread and get a hard hat 