In fairness, Westminster is where this constitutional issue will be addressed and, possibly, resolved. Quite rational for the big guns to be firing from London rather than Belfast.
I don't get the supposed equivalence between shutting down Stormont as a result of Unionist hostility to an Irish Language Act, and shutting down Stormont in protest against the inevitable sea border resulting from the contradictions between the Good Friday Agreement and a hard Brexit policy. Resolution of the former issue was in the gift of the Northern Ireland Assembly; resolution of the latter issue seems to be beyond the wisdom of Solomon.
Speaking of big guns, and on an utterly trivial note, I previously thought of Jeffrey Donaldson as a fairly tall man, but he now appears to be of a similar height to Robin Swann. Is he being physically ground down by the pressures of his job(s)?