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I don't think this is useful distinction nowadays. If Willow demonstrated RCS within 100-qubit, I don't really think there are physical limitations for them to implement Shor for 50-bit integer numbers. It is just less impressive so they are probably saving that work until 1000-qubit achieved in a few years.

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Shor requires very good qubits to work, with a very low error rate. When someone will have a QC good enough to actually run it, even for small numbers, they will be screaming from the rooftops about it.

Willow has only ~99.7% 2-qubit gate fidelity and poor connectivity. This is many orders of magnitude too low to run Shor's algorithm for a 50-bit number. The improvement has also stalled quite a bit over the last years (in 2019 they had 99.5% fidelities with similar qubit numbers).

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