I think GNOME being minimalist with extensions is a good thing, but I disagree with what GNOME considers basic functionality or not. Two things that stick out:
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 in real time. 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.
tray icons. GNOME treats background processes like bugs to be squashed. Let's just get real here for a second: sometimes you want programs to run in the background and sometimes you want to be able to see what they are doing in real time. I want my email clients to tell me when I get emails, I wan't my Nextcloud to tell me when there are sync issues, and I want Discord to tell me if I get DMs. This should be considered basic functionality.