No one can know why Apple updated the Mac mini without making any changes. My guess is Intel provided them with limited number of Ice Lake CPU And Apple prioritised the laptop range.
The Mac Mini doesn't use laptop CPU packages. The mini shifted over to using desktop lineup CPU dies with the 2018 model. It is a BGA package but if a chip configured for much closer to a desktop usage profile. There are no Ice Lake desktop CPU products now. THere aren't going to be any going forward either. The desktop line up is going to be "Comet Lake" for the '10th' generation. That basically is rewarmed over 14nm microarchitecture utilized in the Mac Mini now. To a substantive extent "Comet Lake" is previous generation run "harder" ( up clocked , run hotter , and minor tweaks to the CPU packages to make them do incrementally being run "harder". ).
The Mac Mini really doesn't have a lots of thermal buffer zone to leverage a "run it harder" CPU package in. The other major complaint can see re-occuring in this thread is the GPU. Nothing substantive done there either.
The next changes the Mac mini needs is 10th gen processor, DDR4 RAM and improved graphics. They’ll probably reduce the cost of upgrades for SSD and memory in line with their laptops.
Intel has released both 14nm and 10nm parts in the "10th" generation. It isn't a 100% uniform move forward across the board. Apple skipped moving the MBP 13" two port forward to a "10th" gen 14nm part. what the mini has done is mainly aligned the same way. All the substantively improved graphics have been held to the 10nm parts so far. So if want better graphics there is nothing there with 10th gen Desktop options.
There are no substantively improved in the desktop CPU space at all for most of the 2020. ( Both Intel and for most part also AMD ). Late 2020 Intel will have "Rocket Lake" which should pick up a substantively new design. The iGPU on those may or may not be compromised on those ( either for bigger x86 cores (because backporting a 10nm design and larger AVX512 units ) and/or to keep core count high. )
I'd expect an Mini update much more in that time frame. Skip Intel "Comet Lake" deskttop "10th" gen all together and either pick what presumably will be called 11th gen ( still on 14nm but cleaned up and new microarchitecture ) or perhaps shift to AMD. [ E
But as with the current new releases Apple didn’t include WiFi 6 so the major upgrades will be implemented with Tiger Lake (USB4 over Thunderbolt 4)
Probably not. Again, technically there won't be any TigerLake desktop versions either. ( just like Ice Lake). So unless Apple is going to put the Mini back on the mobile processor path again , it probably will not be Tiger Lake.
There seems to be indications that Tiger Lake and Rocket Lake may share some x86 cores and higher probability they will have the same baseline for the integrated graphics.
WiFi 6 is present in Ice Lake associated PCH (I/O ) chips. Why Apple didn't implement it appears much more about some hang up that Apple has versus what Intel is giving them . If Apple punts again later in 2020 on WiFi it is probably again more so on what Apple is doing versus parts they could have .
but this is likely 12 months away at least.
Probably less that 12 months from Rocket Lake (or Tiger Lake ) . But perhaps arrive too late in 2020 for Apple to do much with it. If Apple does nothing until late into April or early May in 2021 it is because they have put minimal effort into doing something.
If Apple were willing to let the Mini get incrementally bigger they could stuff a dGPU onto the logic board and goes with something new. More likley though they will let the current dimensions of the enclosure be a constraint. that is what is going to add more time versus what is available over next 2-6 months.
However, it is what I am waiting for before buying new Macs.
Held to the current constraints the Mini can get better. both Intels and AMD ingrated graphics should be much better late 2020 (maybe very early 2021 due to software/driver slide on the new graphics. )
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