Downsides of Using andThen Instead of flatMap or map in Effect

I'm curious if there are any downsides to using andThen instead of flatMap or map? I see it has to decodeUnknownPromise` and stuff.

https://effect.website/play#97b8e46eeb2c

Wrote a little playground with comments for feedback as we were looking through it and couldn't really grok why some worked / didnt / how it changed things
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