I’m good with just thinner frame The issue with just outer frame (visually) is that if you make really big window, like 4x4, you kinda don’t get it that there is a window.
One thing that maybe could be done is make tiling textures like for rock, where you have 8 (or something like that) textures that show in certain order and make larger textured surface. If that would be done for glass, maybe making 2x2 grid it would be interesting, but there would be few issues with that, when you make 1x1 you’d get only two sides framed, another issue is that you’d have to align your build to 2x2 glass texture if you want to have frames at specific point. All in all not much we can do from user side than tweaking a texture where possible
I think it’s much better, but shouldn’t they have at least a little reflection? And maybe also not only thin border but also thin glass; no one uses 1-meter-thick glass to make windows.