Planned obsolescence. That's how Apple force consumers to "upgrade" their hardware that is otherwise still good to use.I 100% agree with this.
It is totally obvious that Apple is focussed on M and not Intel [and it is not a surprise really].
I will cease using my intel MBP16 as a mac once the new MBP's are released, and just keep it as a windows machine. All the attention will be on the M's and everything will be optimised for those, whilst the intel machines will languish.
Why do you think there are threads here for "Mojave for unsupported Macs", "Catalina for unsupported Macs", "Big Sur for unsupported Macs"?
I have Big Sur running on my 2012 CMP using OpenCore Legacy Patcher (OCLP) without any issue following one of those threads.