I was helping a friend move a sectional out of a studio apartment and into a house with actual rooms, and the thing that had looked fine squeezed against one wall suddenly looked like a parked bus in the middle of the new living room. That's when neutral clicked for me. Not because gray or oatmeal is exciting, but because a sofa that color just quietly works in whatever room you drag it into next, and you will drag it into another room eventually.
Where neutral gets into trouble is when the rest of the room is also trying to stay quiet. A pale sofa against pale walls and pale floors just disappears into a kind of beige fog, and you end up with a living room that reads as unfinished rather than calm. It needs something with actual contrast to lean against, a dark rug, a piece of wood furniture with some grain and color to it, a wall that isn't afraid of a shade. I made that mistake once, put a cream sofa in a room with greige walls and a jute rug, and the whole space looked like a waiting room for a dermatologist. Neutral works best as the thing everything else gets to react to, not as one more layer of sameness.
What separates a neutral sofa that ages well from one that looks tired after a year has almost nothing to do with the color and everything to do with what's under the fabric. Flip the cushions, check if the covers zip off and can actually be washed or at least spot cleaned, because neutral shows everything, every coffee ring and dog print, and if the fabric can't be cleaned you're stuck staring at it. Check the frame too, hardwood rather than particleboard, and legs that are bolted into a solid corner block instead of screwed straight into chipboard, because a sofa that gets sat on daily for years needs joints that can take the rocking and the kids standing on the arm. A cushion that's mostly foam with no fiber wrap will go flat and stay flat.
If you're starting from nothing, go for a mid tone neutral, something between oatmeal and warm gray, with a removable, washable cover and simple square arms. It forgives more mistakes than true white and photographs less flat than true beige.
The one mistake to avoid is buying the lightest, most "fresh" neutral you can find without checking the cleaning instructions first. That sofa will look perfect in the showroom and compromised within a month of actual living.