If most of the features you use are gnome extensions you shouldn't be using gnome. There are plenty of other desktops that would meet your needs better.
Most? I don't think that someone who installs Dash to Panel would say most of their features are extensions, just some essential ones. I feel like you could go as far as "If any essential features you use are gnome extensions you shouldn't be using gnome."
If most of the features you use are gnome extensions you shouldn't be using gnome. There are plenty of other desktops that would meet your needs better.
Most? I don't think that someone who installs Dash to Panel would say most of their features are extensions, just some essential ones. I feel like you could go as far as "If any essential features you use are gnome extensions you shouldn't be using gnome."