We moved the other way: 2 ponies at home to 1 horse at a yard (stables at home were too small for a horse).
Has the advantage of better grazing - more land, company, help with the horse when we can't do it/go away - and daughter gets paid to ride or look after other peoples horses too, better facilities, school etc, better hacking, people to hack with - the other horses near home are field ornaments only, it isn't expensive (it's the cheapest around), it is not far from home so we don't spend a fortune on commuting, and the yard owners are delightful.
However I miss popping down in the mornings to feed them while the kettle boils etc, and we miss the compost, just coming to the end of our pile.
We do all our own maintenance with our own vintage tractor, mower, tedder, bailer etc, we do our own fencing too, but divvy up with electric fencing to strip graze or track graze. We still cut ours and our neighbour's hay and sell it to a lady up the road, we buy hay for the horse from the farm we're on and it is rock bottom price so we still turn a profit on hay without the hassle of shifting it to the yard, it just gets collected by the lady in our road.