Volume is not organisation
A deep drawer can hold a great deal, but without internal zoning it quickly becomes a pile of bottles, cables, grooming tools and spare products. The drawer may be large while remaining difficult to use.
Premium cabinetry can be organised around the household’s routine: daily cosmetics, shaving, hair tools, toothbrushes, towels and cleaning supplies may each need a different depth and access pattern.
Plan around plumbing first
The storage layout still needs to clear the basin waste, trap and services. Internal organisers should not block access to parts that may need maintenance, and a drawer should not be designed around an assumed basin that later changes.
The most useful organiser is the one that fits the actual products and the actual cabinet, not a generic insert added after installation.
Keep the visible room calm
Good internal storage reduces the need to leave bottles and tools on the counter. That can make a larger difference to the feeling of a luxury bathroom than adding another decorative feature.
The inside of the vanity deserves the same level of thought as the front.
See why tall storage can beat a longer vanity, or read double vanity storage guidance.