Is a target-date fund a good all-in-one portfolio choice?

For many investors, yes — a target-date fund is a single, fully diversified portfolio that automatically handles allocation, global diversification, and the glide path that reduces stock exposure as your target year approaches. You pick the fund matching roughly when you'll need the money (a "2055" fund for retirement around then), contribute, and the fund rebalances and de-risks for you with zero maintenance. The trade-offs: you can't fine-tune the stock/bond ratio or domestic/international split, glide paths vary between providers, and they're best held in tax-advantaged accounts since their internal rebalancing can create taxable events in a brokerage. Watch the expense ratio — good ones run around 0.10–0.15%. If you want simplicity and won't tinker, one target-date fund beats a complicated portfolio you neglect. If you want control over asset location, a three-fund approach gives you more levers.