There are a few reasons why marble may not be the best choice for kitchen countertops:

1. Porosity: Marble is a porous stone, which means it can absorb liquids and stains easily. This makes it more susceptible to etching and discoloration from common kitchen substances like oils, acids, and chemicals. It requires regular sealing and maintenance to prevent these issues.

2. Scratches and etching: Marble is a relatively soft stone compared to other countertop materials like quartz or granite. It can be easily scratched by sharp objects or knife blades, and acidic foods or drinks can cause etching, which results in dull spots on the surface.

3. Heat sensitivity: Marble is not as heat-resistant as other countertop materials. Placing hot pots or pans directly on a marble surface can cause the stone to crack or become discolored.

4. Cost: Marble is generally more expensive than other countertop materials like quartz or laminate. Its a luxury material that requires careful maintenance to keep it looking its best.

5. Long-term durability: While marble can be stunning and timeless, it may not be as durable as other countertop materials. Over time, it can develop chips, cracks, or dull spots due to everyday kitchen use and wear.

Overall, the decision to use marble countertops in the kitchen depends on personal preference and lifestyle. Some homeowners may prioritize the aesthetic appeal of marble despite its potential drawbacks, while others may opt for more durable and lower-maintenance materials.