Is it possible to do an entire home interior in cement board & avoid flimsy drywall?
You're entitled to your opinions, that's for sure. Meanwhile, the rest of the world is building very nice homes that will last for a century or longer from the materials that you say are so insufficient. Poor installations of the best materials will yield products that won't last.
If you have the financial means you're well within your rights to try to re-invent the wheel.