Chrome's release strategy is actually quite interesting.

https://chromium.googlesource.com/chromium/src/+/master/docs...

They release often for the same reasons you would do continuous deployment. Release a little, but often. It helps them to better isolate regressions in the field and deliver non-critical security fixes quickly.

I know I say that it helps them prevent regressions and this post is talking about regressions, but it's also work keeping in mind that Chrome telemetry is insanely extensive. I'd wager that in the field, to the typical user, that Chrome 80 is actually faster than 75.