Yeah, you would think that. But the Guadacanal episodes sketched over the naval actions and the planes from the various national airforces at Henderson Field got no mention at all. Think some Aussies got a bit miffed over no mention of them defeating the Japanese on the Kokoda track or at Milne Bay either...programme simply relates that it took a further year for the US to build up its strength for more offensives....but it's not really about what the Aussies did or didn't do.
It's a look at what happened to three individuals...I'd read the book of one of them, Robert Leckie, before (was called "A Helmet for my Pillow"). They fight in Guadalcanal, then have a year off, then not sure where next...New Georgia? Peliliu for sure, and apparently also Okinawa. Unfortunately it means everything is compressed, but whereas Band of Brothers seemed to get the mix right, The Pacific just isn't doing it for me yet. I think the focus on a company was better than the focus on two or three individuals. But...early days yet.
Having said that, even with Band of Brothers things were very compressed...eg it took a whole day in reality to take Carentan, then the Germans kicked them back out of it and they had to capture it all over again, the second time against only a rearguard as per the series. So there are lots of things they missed out or shortened.