I've got a few because, shock, I need them for swimming through the winter. I swim in a lake and an outdoor unheated pool so have a clean dry one to put on after getting changed and one to put on straight out of the water that gets damp whilst I get changed.
I once came out of the water when it was snowing, got changed, put on a dry robe and popped to Tesco's on the way home. Someone muttered 'DryRobe wanker' to their mate as I walked by, It wasn't my finest moment but I did turn round and tell them I'd just got out the water, which was exactly what they're designed for so he could jog on.
They're not that great as everyday coats either to be fair - I wear multiple layers under mine, plus a hot water bottle/scarf/gloves and look like the bird feeder lady from Home Alone, they're big bulky things, and breezy by design (you're meant to get changed under them!) not sure why people think they look good in them! Do I love seeing them on the high street far far away from any body of water?! Nope, but it doesn't make me ansty, just a bit eye roll-y.
If you want a coat that sort of ticks the dryrobe boxes (warm, roomy, lined) I've got this one and it's perfect -
One-Size Waterproof Jacket (Khaki) – Holland Cooper ®