an app launcher. Literally every other desktop on the planet has one, how this isn’t considered basic functionality is beyond me. Give your grandparents a vanilla GNOME computer and tell them to get to Facebook and you will see how necessary this is. Default should be dash-to-dock with intelligent autohide so you only see it when you need it. This would fulfill GNOME’s hangups about it while also improving usability, so I fail to see a downside.
GNOME does have a launcher, which works just like the launcher on Mac and Android. You can even select whether to see all your apps or only the most-used ones. I do agree that a taskbar/dock with intelligent auto-hide is a must, though (at least for my usability). That’s also not to say that some folks would rather have a Windows style launcher, and there are several DEs that provide that.