Any opinions on this particular viewpoint?
Yes I have an opinion on this for what it's worth.
I think that replacing old damaged windows with modern double glazing is a repair and replacement and not capital expenditure. I know it was a debatable point 20 years ago in Ireland, not sure if it is any more, don't recall ever reading anything definitive on it. Revenue have never made a full list of everything that could possible be a repair and replacement versus capital expenditure. But I know I charged it as an expense myself. I have no idea how one would go about buying anything other than 'standard' double glazing when replacing old and damaged windows.
And thanks for the link, should I ever have to argue the point with revenue, that link is perfect. Accountants take note. What do you think Tommy? Actually I'll print out the link and put it in my file of 'what to argue' with revenue if audited.