Floating toolbars were an interesting flourish to show off the capabilities of GUIs (Photoshop being the most famous application to take advantage of this). And with floating toolbars, the application switching model made sense. But when virtual desktops landed on the Mac, it was a ridiculous hassle to move an application to a new desktop because there's tonnes of windows to move around. Now various programmes that used to use floating toolbars have moved to use main windows that hold all the toolbars (Photoshop being the most famous application to have done this).

With multiple monitors more prevalent now, the application switching model is definitely broken. Command-tab raises all windows for an application across all monitors. This is super annoying.

I mean, even Gnome gets this wrong but at least there's a toggle to fix it. I hope Apple can come to terms with this and fix it some day.