There's nothing wrong as long as the bananas are ripe to perfection, they shouldn't be under or over, its the same with the cream no under or over whipping, the fine art of the Banoffee Pie escapes most.
The Completely True and Utter Story of Banoffi Pie – Ian Dowding
The inventor of the banoffee pie has died - Telegraph
The shit you learn online during the course of a day!