Smooth is better when dry and road/track is clean.
Grooved is better in other situations.
F1 cars swap to non-smooth tyres in the rain. Because they can. They do pit-stops.
You can’t swap, can you? You drive on normal roads, which are likely to be wet, or have gravel, or dirt, or stuff on them.
So you need grooved tyres, because it is very rare that you will be able to make use of smooth tyres.
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