I became a lone parent by choice, it was fine and I had a fairly easy ride, but then I had 14 months off work, with all but two on full pay, I was also able to go back to work part time without struggling financially, which makes a huge difference. I was also able to gain a space at a nursery next to my work, which reduced childcare even further and my employer allowed me to leave early rather than take my lunch hour. Not having to worry about money was a really significant thing in being content as a lone parent, as it significantly reduce my worries.
I’m now married and I now have two children, again, we’ve had a fairly easy ride, we both work part time, so we both get 1:1 time with the kids, but we also both get alone time etc on a fairly regular basis.
For me being a lone parent only had downsides if I was unwell as I had no one who could look after my son, then if he was ill a lot I had to take all the time off work, rather than sharing the time of equally with another parent. If I had worked fulltime it would have been harder as I simply would have had no time at all to myself once he was at school etc, and sometimes you need that for your own sanity. But we’re both men, so you’ll probably ignore that.