Recessed lighting works best planned in layers: ambient light for the room, task light over counters or desks, and accent light on features or artwork, rather than fixtures spaced evenly at one brightness. Whether a project uses new-construction housings on open framing or remodel housings that clip through existing drywall depends on ceiling access, and where insulation sits above the ceiling, the fixture needs the correct IC rating.
LED fixtures also need a compatible dimmer. An incandescent-rated dimmer left in the wall often won't run a new LED can smoothly, showing up as flicker, buzz, or a dim range that doesn't go low enough. Circuit capacity and how many fixtures share one switch leg both factor into which controls will work.