Most recipes for banana cake use about 1 part banana to 1 part flour. That's way too little bananas. My cake has 175 g bananas to 70 g flour, so the ratio is 2.5:1. With so much bananas, it literally bursts with banana flavour.
When banana cake has a lot of bananas, it becomes dense and wet. IOW, it turns into banana bread. That's a good thing if you like heavy and squat banana bread but I