The catch with bedroom wall lights is the wiring, and I say this as someone who once had an electrician out to a guest room three separate times because the switch plate ended up on the wrong side of a headboard that hadn't even arrived yet. Get the position wrong and you're living with a lamp bolted to the wall at exactly the height to clip your head on the way to the bathroom at two in the morning. Still, once they're right, they do something no bedside lamp can, because they free up the whole top of your nightstand for a book, a glass of water, and whatever else migrates there.
They sit well against a plain painted wall or above a simple wood headboard, where there's nothing else fighting for attention. A plug in sconce with a fabric shade reads soft and a little old fashioned, the kind of light that makes a rented room feel like someone actually lives there rather than just sleeps there. Metal ones, brass or blackened steel, do a cleaner job in a room with more going on already, a patterned quilt or a busy rug, because they don't add another texture to the pile. Where I think they genuinely change a room is either side of a bed with no space for tables at all, which is more common in small apartments than anyone admits.
Where they fall short is anywhere you move around a lot before bed, reading in different positions, propping yourself up, changing sides. A fixed wall light throws its beam exactly where it was installed and not an inch further, so if you like to curl up sideways with a book you'll end up reading by the glow off your phone instead. They're also a poor fit for a rental where you can't drill, unless you find one of the battery or plug in versions that uses an adhesive mount, and even then I'd test the weight on the wall before trusting it overnight.
On delivery day, check the arm actually swivels if the listing says it does, because I've had two that were advertised as adjustable and moved about as much as a doorknob. Check the shade sits level once it's up, not just in the box. And ask before you buy whether the bulb is included or a separate size you'll have to hunt down later, because nothing kills the mood of a new light faster than discovering you need to order a bulb before you can even use it.
Would I rather have this built into the wall for good, or is my bedside table doing just fine without it?