I normally say why - even if they're 'experienced' sometimes people can sometimes come from, say in this case, cultures where copypasted code is normal. So say

I normally say why - even if they're 'experienced' sometimes people can sometimes come from, say in this case, cultures where copypasted code is normal. So say why: * "We're repeating this in a few places. Could you extract this to a separate function? It'll keep the codebase smaller and more readable, and if we update it, there's only one place we need to change."