Sorry, I was confused with what you wanted. I thought you just wanted the handsfree read and reply, but you want the automatic announcement as well.
The automatic announcement does require CarPlay or AirPods/Beats. From what Jamze mentioned it also requires Pixel Buds on the Android side. I wonder if there is a specific protocol being implemented that requires something standard bluetooth does not provide.
On Android, the functionality is enabled by the Pixel Buds app that installs with the Buds. An example of Google keeping some Google Assistant features exclusive to their own hardware to give them a USP I think.
So I carried on listening and got the comments about Mac Outlook looking better than it’s Windows counterparts. As a long-term Windows user, this is because Apple values form over function, whereas Windows users value functionality over form - that’s why Starbucks users have Mac Books 
Also re the chart from the early days, it was basically the start of the personal computer market, at one time I used to prep audio files for games for a large games company and had to generate over a dozen versions of the same file in different formats, we had lots of different systems here in the UK.
One final thing, while contracting in LA I was in a computer shop when a guy came in and asked for a Visicalc - shopkeeper placed a box on the table and customer started getting irate insisting on having a Visicalc. Turned out one of his friends had an Apple II with drives, screen and printer that ran Visicalc - that was what he wanted - a Visicalc system.
With no apparent support for calDAV/cardDAV, I’ve never used the Windows Outlook Client, other than when I was forced to at work.
The Win11 Mail app seems buggy. Keeps crashing. So I’ve gone back to eM Client, which is still the best client on Windows IMO.
Never had a problem with Outlook, calendar functions work fine with ICS, brings in multiple accounts and does everything I need. But then I am a functionalist.
