Helsinki has many DCs connected to the district heating network, but it isn't realistic in places that don't have an existing network as creating one in the first place is a huge political/nimby issue. Amsterdam has been trying and failing for years.
There are no financial or career incentives to optimise existing, working things in these institutions. The structures which these large companies use are for people working on new things, so that's what we get. Making office faster doesn't create headlines, but a new product that does the same thing somehow will.