Leather itself is not dated, although certain sofa shapes may be, and we can leave those safely in the past.
A sofa’s comfort comes from its cushioning, suspension, seat depth, proportions and construction, rather than its upholstery alone. Leather may be used on a precise, architectural frame, but it can just as easily cover a deep modular sofa designed for stretching out, settling in and staying there for the foreseeable future.
Many leathers also soften through use, gradually settling and responding to the way you sit until they feel more relaxed, familiar and considerably less like somewhere you are waiting for an appointment.
On the right design, leather can feel warm, contemporary and beautifully understated, working equally well across slim sofas, generous modular lounges, dining chairs and sculptural occasional pieces. It also pairs naturally with timber, stone, wool, ceramics and heavily textured rugs, introducing warmth, contrast and depth rather than making a room feel dark, heavy or overly masculine.
Leather does not dictate the mood of a room because, ultimately, that depends on the design surrounding it.