Why the patio has an off-season and why it doesn't have to
The patio's off-season was never really about temperature. It was about the heat source. Build the right one in and the calendar stops dictating when the space is usable.
Think about what actually keeps people inside once the warm months pass. Cold is part of it, but cold is solvable. The bigger friction is everything that traditionally came with making heat outdoors: the kindling and the matches, the smoke that follows the wind around the table, the ash to clear the next morning, the sense that a fire is an event you stage rather than something you simply switch on. Faced with that much effort, most people don't bother, and the space goes idle by default. The patio feels seasonal because the old ways of warming it were seasonal.
Remove that friction and the premise flips. The goal stops being a longer season and becomes no season at all: a space that is the obvious place to sit on a mild spring night, a crisp autumn evening, or a still winter afternoon with a coffee. Year-round outdoor living was never blocked by the patio itself. It was blocked by the thing you were burning to keep it warm.