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> MicroPython implements the entire Python 3.4 syntax

Python 3.4 is now over 6 years old. Are there plans to add features from newer Python releases? Or perhaps the developers feel that Python's newer features wouldn't "pull their weight"?

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Python 3.4 is actually the baseline for MicroPython these days. Many other more modern features have crept in; such as f-string support that was recently added. And the asyncio support is a modern implementation too...

Generally MicroPython can absorb modern Python features where the implementation can be shown to be efficient, particularly with low RAM costs.

I'd be interested in knowing how much bigger Python has gotten since 3.4 time frame. If course it's not unthinkable that it could always get smaller if there's a lot of refactoring going on, but that might be wishful thinking.

Resource usage is carefully considered when introducing new features; but there are cases where it has becomes smaller. The recent addition of LittleFS meant that a couple of KB more RAM was available at boot for example.

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