Ext4 is a filesystem. That is the part of the kernel that actually stores and retrieves the files on disk. What program are you using to browse files? It’s a bit hard to tell from this screenshot what program it’s a screenshot of, but it looks like Nautilus (the default file browser in GNOME). Is that it?
It occurs to me that sendmsg() is already kind of a standard, and the problem of drop in replacements could be solved by just making the replacement bind to the same file path and emulate the same protocol, and the problem of automatically starting the daemon could be handled by a systemd socket (or even inetd if you wanna go old school). The only advantage that I can see dbus really having over Unix sockets is allowing multiple programs to respond to the same message, which is a definite advantage but AFAIK not many things take advantage of that.
I often search for things with plenty of results on any other search engine and get one or (more commonly) zero results from Startpage. I remember they used to be a proxy for Google. I’m no longer convinced they are.
fair enough, but $12/yr for something I can do whatever I want with vs several grand once for an immutable monkey JPEG that i cannot do anything with except sell to someone else…