The lack of change could be a big turning point, or it could have almost no effect at all, depending on how it is acted on. The RNAS could become much improved if the right people have the right ideas, and are funded by the same old government that OTL didn't seem to have funds. Coastal Command, including maritime strike, under RN control, could become a more effective entity with the exact same provisions. Budget allocations would have to be modified, or shared with other RN services. Bomber Command would wield a smaller stick, but you cannot believe the bomber will always get through and not have bombers. OTL combined operations CAS would still depend on somebody coming up with the idea of establishing the correct administration and protocols for future battles, and ensure that equipment and weapons are available, in timely fashion to do so.
It all requires someone with an analytical mind and a steadfast determination to effect the correct course, in the right post, at the right time, as Dowding did with Fighter Command. But they need more Dowdings. Many more.