Why is the Ignition Designer UI so outdated?

You might be suprised, but not everyone uses dark mode.

I don't. I develop in Visual Basic, Java, Python, C++. I aslo use AutoCad, and OnShape. I do not use dark mode. I find it makes things harder for me to read. And dark mode in the wrong lighting actually causes more eye strain.

You want dark mode, that's fine, you are not alone, but there are many who don't want it.

Some relevant reading: