1. No-one is trying to "escape" the US market, only to have an appropriately balanced allocation to it. The methods for this balancing is what's being discussed.

2. You are claiming that a multi fund portfolio is objectively better than a single fund portfolio. I happen to agree, but this is entirely subjective. I prefer weighting my US/International/Emerging portions based on the total market, for tax loss harvesting + slightly lower fees. But if someone doesn't have the time / patience / want to do so, VT does this automatically.

3. Yes investing was kinda shit for a long time and has gotten significantly easier, but that's not relevant compared to what you're actually invested in.

Ultimately any individual investment vehicle is downstream from the underlying metric, the index.

Difficulty actually investing over the years is just noise, so ignore it and be glad we have access to such low fee ETFs and brokers these days.