Just noticed that taping on the date in the notification shade on Android opens the clock app instead of calendar... God damn this is mildly annoying

Actually it doesn't. It's just that the time is much bigger than the date, and thus the touchable element is also bigger. If you're really careful, you can hit the date, which will open the calendar.

Did for me at least, running a Huawei P10 Lite with Android 7

Like so

Must just be stock then...

Tested multiple times on my pixel 2 xl and still opens clock

@lxmcf That might also be the case, yeah

For me tapping on clock opens clock and date opens calendar (=perfect). Though I've had devices where both open some settings for time (=annoying).