And you simply build with glass in the late game since you can’t insta mine it. And you can clay.
I use glass similarly to this for early-game egg defense and late game on tea to get back up to main-level mid. A layer around the obsidian slows people down just enough to prevent them from blocking themselves in most times. Or it forces them to use tnt (which will then definitely alert the whole base as to their presence). Tea late game most dangerous people have 25+ pickaxes so you need glass to get back up without getting spleefed.
The issue with bridging with glass, tho, Fesa, is that it has a much lower blast resistance than clay. one tnt down and it's like a slightly delayed mega-spleef. It's hard to keep in mind just how far that blast will destroy so I end up with a lot of kills that way. >:)