Allow Smart Home Skills to utilize a direct web service URL instead of Lambda
We have several Smart Home skills in which the Lambda component only acts as a passthrough to our real servers. This adds a fair bit of overhead to every call since Lambda invocation must recreate a full SSL connection to our main backend. In cases where our main backend is in a different AWS region than Alexa, this can add up to several hundred milliseconds. There is no way with Lambda to keep a persistent connection open, so every request has to start from scratch.
Custom skills don't have this restriction.