Everything a device sends changes how confident a suggestion is. None of it sets the weight on the bar — your logged sets do that. And Rhythm never shows a provider's own scores back to you; what you read is Rhythm's plain-language take on your day.
The honest limits
Overnight wrist temperature comes only from the newer Apple Watch models that carry the sensor; an older watch sends heart rate and sleep but no temperature. And a wearable is optional: Rhythm reads your training log first, so it works with nothing connected at all.