Your perspective seems to be focused on a subset of type of businesses/organisations. e.g We're an agency - no 2 websites are designed the same. A website will get built, launched, general maintenance, until 5-10 years down the line the client wants a brand new website anyway. So having any requirement to "theming" or global changes - has never happened for us and a client in 10 years. So don't worry until it happens!
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Your perspective seems to be focused on a subset of type of businesses/organisations. e.g We're an agency - no 2 websites are designed the same. A website will get built, launched, general maintenance, until 5-10 years down the line the client wants a brand new website anyway. So having any requirement to "theming" or global changes - has never happened for us and a client in 10 years. So don't worry until it happens!