Dropping older Macs from support by the latest and greatest OS is not arbitrary. There is more to a Mac than the CPU and the RAM. My 2019 intel mini has a T1 chip for security and other features that its 2014 predecessor does not have. Both have Intel I7 4 cores with 32gb RAM, but not the same generation. Also, the 2019 Mac has Thunderbolt 3 and USB4 support as does my 2020 M1 mini, but the 2020 M1 mini runs my Intel programs and graphics faster than the 2019 Intel mini. M1 includes a lot more than the CPU and RAM on just the 1 chip. Its graphics processing is way more powerful and capable than what is built into the Intel chips. Plus there is the neural net engine, Secure Enclave and other capabilities of the M1 which make it better for video and audio streaming. Apples's decisions have more to do with implementation, performance and reliability than anything else. If your new computer's does something fast using built in chip capabilities, why implement a slower and probably less reliable version that doesn't have the hardware support?