Does adding more asset classes always make a portfolio safer?

No. Past a point, extra asset classes add complexity and cost without meaningfully reducing risk. The big diversification wins come from a few broad exposures: total U.S. stocks, international stocks, and high-quality bonds. Once you own those, piling on commodities, private funds, niche sectors, or a dozen thematic ETFs usually adds fees and tax headaches more than genuine protection.

Also, in a real crisis, correlations often converge, meaning assets that normally move independently can fall together, which limits how much 'safety' extra pieces provide. A clean three- or four-fund portfolio is diversified enough for the vast majority of investors. Simplicity has its own payoff: it's easier to rebalance, cheaper to run, and easier to stick with. If you're tempted to keep adding, ask whether each new holding does a job your existing ones don't already cover.