The answer to 'why is my recessed lighting hot to touch' is that recessed lights can get hot due to the heat generated by the bulb or fixture. This is a common issue with recessed lighting and is usually not a cause for concern, as long as the heat is not excessive.
The heat is generated by the electrical components and the bulb itself. Recessed lights are designed to dissipate this heat, but over time, the heat buildup can make the fixture feel hot to the touch. This is especially true if the recessed lights are used for extended periods or if the insulation around the fixture is not adequate.