I find it frustrating for all the power they want to give me... that some basic service design is lacking. Polly is a stand alone component but the reverse is

I find it frustrating for all the power they want to give me... that some basic service design is lacking. Polly is a stand alone component but the reverse is closely bound up into Lex which is a conversational interface API. Amazon has internally built an engine I could ask to convert an audio file in S3 into a text content representative of the audio file... yet I can only use Lex to drive a conversation via text and audio. If AWS really want to give me the power of their AI tools. How about unbundling them?