What software does the world need?

Qutebrowser isn't FF or Chrome dependent, yet it lacks privacy tools and doesn't support addons/extensions, maybe in the future it will be a viable option.

Not him but

It depends on QtWebengine which depends on chrome.

This is my complaint. They prioritize emulating Vi keybindings over the security and maturity of the browser. Until they have a domain-based content blocker like uMatrix--I'd even settle for a pattern-based content blocker like uBlock Origin--and a blossoming extension ecosystem, I'd settle for FF despite its shortcomings, because they're easy to amend.

Easier to ask what software the world doesn't need because that list is much bigger.
But the world needs a FLOSS alternative to everything.

what are you even saying

A cross-platform GUI toolkit which is easier to use than html/css/javascript/embedded-browser combo.

FOSS SFM
The only reasonable FOSS SFM program is Bundler, which abandoned development around 2009-2010 and never got past generating a point-cloud. Newer packages, like Autodesk's proprietary "123D" go so far as to generate a mesh and texture it.

Distributed ANN run by anons
A distributed bittorrent-like swarm of neural nets where each user trains and maintains their own "cortex" that can take inputs and deliver outputs to and from others.

Node editor for shell commands
Something like the blender node editor, except that each node is a shell command with the inputs/outputs being pipes.

Not quite what you're describing, but this is a thing:
pipecut.org/

MITM is the correct way to do it, I have a som9331 sitting on my desk specifically to do just that.