YMMV, of course. The problem with lock-in is that you start designing code that is for a given vendor, AWS in this case. Once you find that the vendor either is

YMMV, of course. The problem with lock-in is that you start designing code that is for a given vendor, AWS in this case. Once you find that the vendor either is prohibitive cost or functionality-wise, you will have to spend your development resources untangling the mess rather than shipping value.