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> At this time, the original App Engine-only APIs are not available in Second Generation runtimes, including Python 3.7.

This means that if you already have a significant app running on Appengine Standard, none of the built-in APIs are supported (memcache, images, search, task queues, email, etc). That's a significant blocker to anyone wanting to upgrade their existing Standard 2.7 app to 3.7.

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The sentence before that quote:

> We are progressively evolving the original App Engine APIs to make them accessible across all GCP platforms.

So I think they're planning a solution for you.

Correct, but for us (migrating from AE Flex to Standard) it meant that it was working out of the box.

It seems to me this product is mainly targeted at 1) new customers, and 2) AE Flex customers wanting to switch to Standard.

The third category (Existing 2.7 Standard customers wanting to just upgrade to 3.7 -- which is me unfortunately) are going to be disappointed and stuck in a hard place, I think.

What would be the incentive to migrate from AE Flexible to Standard if these apis are not there? The only thing I can think of is scale to 0.

Scale to 0, faster scaling up/down (no need for full VM spin up), faster deployments, less surface area for attack (maybe?).

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