I have never felt the need to use more, also I mainly navigate with Super + Alt + {Left,Right}.
Though Gnome workspaces are not intended to be used like they are on a tiling window manager; you should just use the workspaces you need and dynamically create them and move apps. Assigning an app to workspace 10 that just stays there all day until you need it ist not the intended workflow.
That’s just the logical conclusion of continuing development. And even if the API stays the same, the shell might function differently, which could lead to extension bugs, therefore it is safer to break them all until the extension developer validates it for the new version.
You could of course force the internal stuff to be the same, but this would just stifle development and innovation.
In my opinion, if you can only use Gnome with extensions, you shouldn’t use it in the first place. Personally, I do have extensions, but they do so little that I don’t have a problem waiting a week or two until they update. Extensions don’t influence my workflow, they just are small quality of life adjustments (e.g. hiding the battery indicator when docked to my monitor and fully charged etc).
I don’t really know what you mean, I don’t have a delay when opening apps, at least not a noticable one. However, do keep in mind that Gnome isn’t really meant for slower hardware.
Do you mean an audio output/input switcher? Because they added one a few version ago.
Gnome is definitely keyboard driven, this is my workflow: Use Super + type name to launch apps, then tile them left and right with Super + Left and Super + Right. Two apps are enough for a workspace, if you need more, move to a new workspace using Super + Alt + Right. Gnome automatically creates new workspaces as you go, so you always have enough space. Swap between apps using Super + Tab. Almost like a tiling window manager, right?
The plugin system is indeed very good, extensions can do pretty much everything. They break on an update because it makes sense: The author designed the extension for a specific version of Gnome, and it can’t be guaranteed that it still works as intended on a newer version. You surely don’t want an outdated extension to really mess up your desktop when it hasn’t been properly updated. This is the safe way.
And regarding customization? Funny story: when I started with Linux and I wasn’t really into the meta yet, I started with KDE, but I switched to Gnome (GNOME 3.xx and GTK3) because I found it EASIER to customize. Gnome themes always looked way better than they looked on KDE and they were never bugged (e.g. missing contrast, wrong iconography). Also “extensions” were way less bugged than KDEs equivalent features. I only later found out that people preferred KDE because of its customization. However, I do agree that with Libadwaite, they really put an end to Gnome theming, but all in all, I think it’s better because of app uniformity and an easier app development process (you can really see the Gnome app ecosystem flourish). Also, Adwaita looks pretty amazing nowadays, I don’t really feel the urge to theme my desktop.
I have used XFCE, KDE, and GNOME and in my opinion, Gnome provides by far the best the best workflow for me. The UI is very keyboard-driven, which makes navigation very fast and intuitive. Also it doesn’t look like an outdated Windows version (like Plasma or XFCE) and I had way fewer bugs with it than with any other desktop.
I find it interesting how everyone always talks about the „Unix philosophy“ („software should do one thing and do it well“) but at the same time everyone likes Plasma for having hundreds of useless, buggy features.
Gnome has a core featureset and a robust extension-system if you need more. There is no bloatware in Gnome. And please don’t tell me something like „Gnome isn’t usable without a taskbar/dock“. It is, lots of people use it that way, not every desktop needs to be like macOS or Windows.
Of course it’s okay to like another desktop environment more, but I just don’t get why Gnome gets so much hate.
You are aware that Manjaro ships a heavily modified version of Gnome (lots of theming-stuff and extensions)? You should try vanilla Gnome (eg. on Fedora/Arch/VanillaOS) or try disabling everything.