Using a bathroom sink as a replacement for traditional kitchen plumbing is feasible and economical, but there are certain factors to consider.
The bathroom and kitchen sink are not twins, with the bathroom sink primarily used for washing hands and faces or brushing teeth, while the kitchen sink is used for dishes, food preparation, and other kitchen-related tasks. However, there is some overlap between them.
Using a bathroom sink for a kitchen sink is not the most practical option due to its diminutive size and depth, porcelain or ceramic construction, durability, aesthetics, and plumbing setups. Retrofitting a bathroom sink drain hole to the larger drain set-up in the kitchen is not an ideal situation.