There is no such thing as "just split" there is 20+ years of legacy decisions and even if the split is relatively clean it is still probably 1 years work for 20

There is no such thing as "just split" there is 20+ years of legacy decisions and even if the split is relatively clean it is still probably 1 years work for 200 people for maybe a marginal improvement. The real money is going to go towards, "make this all more reliable".