Exactly what the cloud is best used for imho. You can focus on your core problems and still shift to a different solution later on when that becomes more effective cost wise.
But still, when I first started in AWS we had lift and shift'ed most of our platform onto AWS and when it came to adding new features I first looked at Lambda instead of building out on the existing platform. The speed at which I could setup the feature and start measuring and iterating on it was so much better compared to doing it on our existing platform. Even though that was pretty ironed out and fully automated.
