Ha ha ha. You're funny....
All of the 50:50 arrangements I know of involve the dad collecting their child, plus a bag of clean and ready clothes, doing his "50%" and then returning child with a bag of dirty clothes, usually missing several socks, having stuffed that child full of pizza and ice cream, and not checked their homework is done.
Or just delivered child to paternal grandparents and left them to it.
I am a single mum. In the last 16 years I have done every school run, nativity play, parents evening, sports day, hospital run including a nightmare 36 hours in paediatric ICU. I've applied to every school, shopped for every pair of shoes, organised every school trip, every child minder, every inoculation, dentist, gp.
I've covered every illness, organised every holiday cover, made every birthday cake, organised every party, sorted every swimming lesson, every club. I've arranged ds' passports and Covid vaccination records.
I have sat through every homework struggle and negotiated with the schools over bullying. I have rushed DS to a&e when ex returned DS to me with a badly infected 4 day old dog bite.
I also work full time.
My ex morphed into a sexist carrogant tosser who can't possibly help because 'he works' . As if I don't. My ex does 20 nights a year and 6 hours a week when he feels like it.
I am a loving committed single parent. He is not even close.