Some of the largest, highest TPS, highest throughput systems in the world use DDB.

The constraints are what let this happen. Unconstraining it might make a better generalist product but part of what you're opting into with DDB is the dumb "put an item in get an item out semantics" and the other side is knowing that it will still work if that volume increases dramatically.

Which makes it a great product in a comparatively small niche, and a "meh" premature optimisation pretty much everywhere else. Except for right at the bottom end where it's a step up from a JSON file in an S3 bucket.

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