I think the problem around all these discussions is that it's put in terms of "would you rather be a lone parent or raise a children with a loving supportive partner who does half the parenting?" as if these are the only 2 options available.
I think it's fairly obvious that the more helpful, functional, loving support you get with parenting from other adults whether they are related to that child or not, the easier the job of parenting is. But that applies to any parent, single or not.
I also think that we need to acknowledge that lots and lots of parents do not have a loving supportive partner who does half the parenting, but because they happen to be married, that deficit goes completely unrecognised. Given the choice between being married to someone who is not functioning in that "ideal" way and being a single parent, often the better choice is actually being a single parent.
Although everything is down to you, at least you know that, at least you haven't planned for something different and been let down at the last minute and at least you've organised your time and life with that in mind so that you've minimised the stress and don't waste time feeling resentment about not being able to do something you have a vague idea you ought to be able to do because you have a partner.
I think it's as valid to cheer-lead for lone parenthood as it is to cheer-lead for coupled parenthood when so many couples aren't living the ideal we're always told is the alternative to lone parenthood. Having said that, it's probably just as valid to cheer-lead any domestic set up that achieves a loving, supportive, functional environment for the child and its carer(s).