Can you link to the source for your stats?
I'm not finding anything to corroborate that -- I'm seeing stats suggesting things like 90% of Chrome users are on the newest version after two weeks:
https://timotijhof.net/posts/2023/browser-adoption/
And Stat Counter shows that the current version of Chrome utterly dominates in any given month:
https://gs.statcounter.com/browser-version-market-share/desk...
The glacial adoption you're describing doesn't make much sense when you consider how aggressively Chrome auto-updates, so I'm quite confused.
My go-to reference is this, which itself cites statcounter: https://caniuse.com/usage-table
I was specifically referencing desktop Chrome, not including Chrome for Android, but other than that, if there are discrepancies, I'm not sure what the cause is.