Any reason to use a run-time assert instead of compile-time assert?

There's no reason to prefer a run-time assert here. You should prefer compile-time errors over run-time errors so there's never a reason, given the option between the two, to choose a run-time assert.

We can't tell without context. In template code, some branches might be unreachable for some instantiations. A compile-time assert would be inappropriate, as that renders the entire function illformed.

An assert() does not.

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