Well, in my opinion it is not normal.Being inside at 8 weeks old is normal. For many they are still too small to integrate so they are in the brooder. Many don't get long sun time until they go into the coop. Even then some can't free range for one reason or another. Now if they were far older than 8 weeks then this would be a concern but this is perfectly normal to still be inside.
Chicks need to be outside from the age of 2-3 weeks on to exercise, explore and get exposure to natural sunlight to prevent behavioural and severe health issues.
Of course they would need a safe coop and secure run to do so.
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