The absolute biggest mistake experienced boaters make when eyeballing a liveaboard is concerning storage space.
It is easy to look at "rooms" and see yourself performing day to day acts and say to yourself...oh...It's plenty big enough.
But for the average person, if you added up all their closet, drawer, and cabinet space in their dirt dwelling, including wherever they store tools, hobby stuff, spare parts for their engines, etc..... that space alone would probably be bigger than the interior cubic footage of their idea of a great liveaboard.
As long as you have something on land that stores stuff, it's better.....
But most totally underestimate how much stuff tries to stay onboard when you live aboard....and way too many people let it grow to the amount where moving it all around to get underway happens less and less till you have a dock condo.