Let's assume that a country has a GDP growth rate of approximately 1% per year (the number is not important). Then the government of such a country can theoretically roll its current debt and even contract new debt and keep the same ratio debt/GDP. Advantages of rolling the debt are easily understandable: you never pay back the principal, only the interests, and can invest money on constructing new infrastructures, or maintenance for the already constructed infrastructures. Conversely, I would like to know
What are the disadvantages of rolling the debt? In which case the advantages of rolling are greater than paying?
So to make it clear (see comments below), I am not talking about political reasons, but purely economical reasons.