Looking to buy a property, and I have identified it has been re-clad with stucco/plaster, over top of existing weatherboard, with a cavity.

I've asked for house history, but this isn't known by current owner, estimate it was done at least 20-25 years ago (by previous owner), either to 'modernise' the house, or the original weatherboard had issues.
Fairly certain it has a cavity, as its hollow to knock, and sticks out at least 50mm past original cladding, encasing windows/doors, etc. (window sills now flush with cladding)

Has anyone had experience buying/selling/owning or doing up any houses that have had this done?

Pro's I can think of: has a cavity, could be more durable, has clearance at bottom, no signs of moisture in/under house
Cons: potential issues around windows/flashings? Issues if replacing current windows with new double glazed units? (due to cladding protruding past window frame?)

While we wait for possibility of builder to review, thought I'd check here.
Purchased and sold houses before (personal home and rentals), so reasonably confident with the rest of it, just curious if anyone has any experience with stucco/plaster over weatherboard.

Ideally in the future we would double glaze (entire new units preferred, as opposed to retrofit glass, as some of the sliding doors need fixing anyway)

Below are 2 photos, first showing how new cladding encases the windows (as cladding is at least 50mm over top of original weatherboard).
Second photo shows how cladding extends over back door step, and encases toilet breather pipe.

Thanks.