The A Series is not going to all of a sudden stop improving. The A series already beats early x86 chips.
At being a SoC for a phone or small tablet. The A series is going to improve along the same lines it has improved.... as being a phone chip. Geekbench scores are not a solution. They are just a relatively narrow metric.
An x86 core all by itself doesn't make for a solution for classic PC form factor computers. Pragmatically, there is a single USB 2.0 port on an iOS device. That isn't going to fly on a laptop or desktop. Bandwidth for discrete graphics? No. More than one display? No. Thunderbolt? No. 3rd party USB 3.0 chips? No.
The X86 kept improving, what makes you think the A series won't?
So if the A series is behind now and they both keep improving at what point is the A Series going to catch up?
Apple has about 1 ( maybe 1.5) world class design teams. Intel has 3-4x that number. Apple could spin up another one to create something that wasn't primarily a phone chip but won't. Three major reasons.
1. Apple is Scrooge McDuck. It is expensive and there is little to no reward here in terms of scale. Apple sells about 10x as many A series chips as they buy chips from Intel. It is
cheaper for Apple just to buy them from Intel or AMD.
Way cheaper.
2. The Mac sales are showing very little group. So no only are Mac not at iOS device scale they are show no signs that they are going to be in the future either.
3. If macOS primary market competitor is on x86 ( Windows ) and Windows is largely x86 only, they are not loosing much competitive wise. Using the some foundation as Windows allows Apple to spread the R&D costs over the whole x86 market which is 9x bigger than the Mac market. ( go back to point number #1 of Apple being Scrooge McDuck. )
Especially when intel is telegraphing that the x86 is not as important as it once was and further development is not a priority.
Priority and significant source of growth are two different things.
Apple has a lot invested in the A series and can't be bothered at this time to be at the whims of Intel when their entire product line depends on the A series.
Because the iPhone market more than pays for that investment. It is billions of dollars bigger market than the Mac market.
It's a forgone conclusion, but people don't want to accept it. Fine. Burry your head in the sand.
ARM ( A Series) solutions don't scale across the same performance market as the Mac sit in. You might be able to get a A Series solution into a MacBook , MBA , hobbled iMac (with MBA processor), but are no ARM (or A Series) that preform in the iMac , Mac Pro zone.
Apple has shifted processor when they can do the
whole Mac line up. That was true in 68000 to PowerPC switch. Was true in the one year transition of
whole line up from PPC to x86. If going off the x86 going to need the same solution. There is no ARM solution for that now. And Apple can't pull one out of the hat on the cheap.[/quote]