All of these features are in KDE Plasma Dolphin.

Take a look the Dolphin settings and panels to enable these features.

The problem is not the lack of ideas, it is the programmers number and tech debt.

You can contribute to Dolphin KDE Plasma File Explorer: https://develop.kde.org/

On the other hand:

• Loop-device exhaustion (slow, though Ubuntu has increased the limit via a patch).
• A single point of failure due to Canonical’s repository imposition (a closed garden).
• Unmaintained branches and snapped apps.
• Implicit installation of snapped apps through the apt CLI instead of the originally supported packages 🤬 (what the hell, Canonical!? Are you doing the same crap as Microsoft?).

The server-side closed garden is the opposite of an open ecosystem and the open-source community. You can add custom repositories to APT or Flatpak. Every new snap interaction feels like another step toward forcing the user to use it, instead of offering cool features that convince users on their own merits.

The last change (installing snapped apps when you run apt install) was horrendous. What’s next? Installing snapped apps when the user runs flatpak install?