OK, but ultimately the customer wants a product built, features added and bugs fixed within whatever timescale and budget. With all things being equal, they would prefer that you spend the time on those things, and not on infra.

Now of course, you will have to spend some time on infra, but that should be minimised as much as possible. Whether that is using a home-grown Kubernetes based platform or a PAAS or cloud solution depends on your requirements, skill-set, budget and time, but your aim should be to have the simplest solution that works.