Cabinets or shelves are not built into more walls for several reasons:
Structural constraints: Walls in a building are primarily designed to bear the load of the structure above, as well as resist lateral forces like wind and earthquakes. Cutting into walls to install cabinets or shelves could weaken the structural integrity of the wall, especially in load-bearing walls. Therefore, builders and architects carefully consider where it is safe to create openings in walls for such purposes.
Space optimization: In some cases, building cabinets or shelves into walls may not be the most efficient use of space. For instance, if the wall is in a central location within a room, it might be more practical to have the wall open for furniture placement or traffic flow. Freestanding or modular shelving units can be more versatile, allowing for flexibility in arranging the space as needed.
Aesthetics and design: Not all architectural styles or interior design concepts call for built-in cabinets or shelves. Sometimes, a cleaner and more minimalistic look is preferred, which could be achieved by keeping the walls free of any permanent fixtures.
Cost and complexity: Building custom cabinets or shelves into walls often requires skilled craftsmanship and additional materials. This can make the process more expensive and time-consuming compared to using standalone furniture or shelves.
Adaptability: Spaces evolve over time, and people's needs change. Built-in cabinets or shelves can be less flexible in accommodating changes in room layouts or future needs. Freestanding furniture, on the other hand, can be easily moved or replaced when necessary.
Maintenance and repairs: Repairing or modifying built-in cabinets or shelves can be more challenging than dealing with standalone furniture. If there's a plumbing or electrical issue behind the wall, it may require removing the built-in fixture, which can be a cumbersome task.
Despite these reasons, built-in cabinets and shelves remain popular in many homes and commercial spaces because they can offer a seamless and custom look, making efficient use of space in areas where they are practical and safe to install. However, a combination of built-in and standalone furniture often strikes the right balance between functionality, aesthetics, and adaptability.