My ex was fucking USELESS when we had DS2 (our first DC together). He's still a bit clueless with him now he's 9yo tbh.
However, with DS3, he has really stepped up to the mark, and is able to pack bags, change nappies etc.
With DS2, I let him get away with the 'feigned helplessness' act, because I didn't have MN back then and was 7/8?years younger didn't know it was an act.
With DS3, I had been suitably educated by MN and RL gained enough knowledge to tell him to get on with it himself!
It's made a huge difference.
Except with sorting out clothes - but ex does have Autism, and struggles to wear matching or weather appropriate clothing himself, so I DO think he genuinely has an issue there - thick woollen black jumper with thin beige 3/4 lengths, anyone?! In below zero temps AND in 90• heat?!
So that's one area I DO still have to do - but then I often have to tell HIM to dress more appropriately!
(He knows he has a genuine issue with this. Doesn't stop him from packing a nappy bag or changing a pissy toddler though...)