Like @gettingolderbutcooler we lived on a barge before kids on a permanent mooring, so we had mains connections which eliminated some of the stresses around pumping out etc. Absolutely the most amazing memories of when we were in our 20s and basically spent all summer on deck having bbqs on the long summer evenings, going boat to boat seeing friends and making music and singing, and pinching ourselves that we got to live aboard with this wonderful life...but never again. My parents lived on it for a while once we had kids and loved it too, but also ended up going back to dry land when the fun wore off.
It was very, very, VERY cold in the winter unless we were in the boat all day keeping the fire going and even then, the cold would cause problems like gas and water lines freezing solid - we once were frozen into the boat and couldn't get to work when all the hatches froze shut and then blew our electrics trying to warm the boat up enough to melt the ice and open the hatches! Everything smelled damp all the time including all our clothes. We had some plug-in heaters but it was never enough. We'd come home from work, light the fire and then get into bed with hats and bed socks and dressing gowns while the boat was heating up. It was better on weekends if we stayed home the whole time and keep the fire going, and then it was very cosy, but you're not going anywhere or the boat will get cold again.
Lots of DIY and fixing the previous owners' bodged DIY, impossible to find any tradespeople who know much about boats, tonnes of painting and worrying about leaks and rust and plumbing and bilge pumps and the electrics blowing. Organising a tow for dry dock and getting hull surveys was expensive and annoying as suddenly our home and all our stuff was hours away from where we usually lived.
The other boats around us were an odd mix of young people like us working full time and having a lot of fun going from boat to boat having drinks on weekends, crusty hippies growing weed on deck, trustafarians with silly posh nicknames who pretended they were hippies and against the system but lived off their parents money, retirees that we called the Meerkats as they would pop their heads out of their boats and glare at you at the slightest noise, and a few very fragile people who were quite vulnerable and we worried about them a lot (one of their boats sank one day when they were out, they couldn't afford the maintenance and refused to accept any help - they lost everything).
It's also pretty physical climbing on and off and around the boat, lifting and carrying, mooring up, stacking wood, heaving around smokeless fuel bags, swapping around gas cylinders etc. If you're cruising that's even harder operating locks and finding moorings that might not be that accessible and stressful moving all the time (we had an address and postcode, paid council tax etc).
Also remember you have to buy in cash or personal loan as you're unlikely to get a mortgage on a boat, and it doesn't increase in value so financially it's more like buying a motor home or a car than a house.
All of the above was easy to cope with when we were young fools in love in our 20s. But I certainly wouldn't do it in retirement!