Down side is, when you make liberal use of these techniques, your use of the CLI becomes aws cloudformation create-stack ... --template-url ... rather than ...--template-body ... (though, if you're using nested stacks, you're already stuffing shit into S3, any way).
aws cloudformation create-stack ... --template-url ...
That 50KiB temlate size-limit's still a bitch, though. Thank god for --parameters.
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