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Yeah and because it's a sink it would just get grimey. We had grooves cut into our Corian worktop and despite not doing much washing up these still get grimey. Mind you we are in London and no water filter/softener so might be different for others. Commercial kitchens don't have those types of sinks afaik and that felt like as good a reason as any. I do think it's pretty smart and is nicely made, so doubt you'd be annoyed at the decision!
the lip would get dirty because it would catch debris being swept from the countertop into the sink?