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The 2018 mini is a T2 Mac, the 2019 iMac is not. Therefore its possible they support the 2018 mini for longer.

The base 2018 mini is a dog with 128 GB storage, 8 GB RAM and no dGPU. I have one as a test machine. I wouldn’t use it for production. The 2019 iMacs 27s are far more capable with user upgradable RAM.
 
The base 2018 mini is a dog with 128 GB storage, 8 GB RAM and no dGPU. I have one as a test machine. I wouldn’t use it for production. The 2019 iMacs 27s are far more capable with user upgradable RAM.
It may be a dog but its a dog with the T2 co-processor. The 2019 iMac is the last Mac released without the T2 and the only Mac without a T2 supported by Sequoia. It supports fewer MacOS features than the T2 Macs (iPhone mirroring being the major one).
 
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It may be a dog but it's a dog with the T2 co-processor. The 2019 iMac is the last Mac released without the T2 and the only Mac without a T2 supported by Sequoia. It supports fewer MacOS features than the T2 Macs (iPhone mirroring being the major one).
So they dropped support for the 2019 iMac and the 2018 Mac mini at the same time (along with the iMac Pro). Support for the Intel cpus in all three Mac lines may have influenced Apple's decision as they seem to have older generation Intel CPUs.

I wonder if it will be possible to install macOS 26 on a Hackingtosh or unsupported Mac using the OCLP patcher? I suspect macOS 15 may be the last version to support that.
 
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