You are right......I think they are the only “major” source that isn’t on line from LAC....Of course not ALL war diaries and Operational Record Books are on line either, but a lot of them.......and Troop ship sailings etc etc
It may be that they have NOT digitized them yet???
I don’t know if you know, but right now, if you have a British National Archives membership (their free) you can download ANY of their documents that are on line for FREE. I’ve been finding lots of new information out.....but again, a LOT of files have NOT been digitized yet, so are not available.
But it is a big help with what they have. I’ve been using them now for a lot of RCAF records for the Middle East squadrons.