Having a finite maturity date is generally preferable over a perpetuity ("forever"). I explained above that the value of a perpetuity declines rapidly when interest rates rise (and interest rates will be rising in the near future). For example, the government of Austria recently issued a 100 year bond, which then fell nearly 50% in value as interest rates increased. A perpetuity is even worse than a 100 year bond.

With a finite maturity, you invest (let's say) $2 million, earn your yield for 5 years (let's say LIBOR + 7%) and then you get your $2 million back and you can decide then how to best re-invest your money at that time given the situation. There is a reinvestment risk here, where after 5 years you might not be able to find similarly attractive investments but unless you an insurance company or a pension fund trying to meet very specific long-term obligations you don't really need to worry about super long-term reinvestment risk. On the flip side, if you get your money back after 5 years you might be able to find an even better investment, and that kind of optionality is very valuable.