The phones are always changing, always adding new features, better radios, you can never keep up. But I completely understand where you're coming from. I'm still on a Galaxy S3 dual-band and I can get an upgrade whenever, looking at the LG G4 but then I think like you, If I just wait another X amount of months, I could get a phone with new radios that can support CCA partners and 3X Carrier aggregation instead of 2.
From the specs though, it sounds like it will be a great phone