Just a note on the T2: it's a variant of the A10, more specifically, it's basically an A10 running a custom operating system (BridgeOS) and with the high performance cores disabled. There might be other modifications, but it isn't the kind of thing I would hold up as a triumphant piece of Mac-specific engineering. Not that it is a bad piece of silicon, just repurposed silicon isn't the sort of thing I would put stock in when it comes to the importance of the Mac to Apple.

The TouchBar was a good example though, even if it didn't receive the warmest reception on the market, it is still a good piece of Mac-specific engineering.