I think the different treatment of Newspaper Archives in FMP is due to how they arose.

FMP got a contract from the British Library to digitalise newspapers - and as with some other projects (e.g. early 1911 Census release) they put it on a separate site (https://www.britishnewspaperarchive.co.uk) with a separate subscription.

Your FMP sub gives you an inferior access to the collection - hence the deluge of data. You can use advanced search on BNA and find articles of interest and then either pay a sub - or try and find the same articles via FMP!  Ideally FH needs a BNA Hints facility (or FMP needs to properly merge the two sites as they did with the 1911 census - but perhaps with newspapers there is a distinct market for access and they want to maintain the premium service of BNA?)

David