Earlier quoted context omitted.
You'll get more fine grained tax management, e.g., tax-loss harvesting if using something like Wealthfront. You can't pass along these individual losses (and net against other gains/carry over to future years) with a target date fund. I actually use Vanguard target date for my tax-advantaged accounts, but I use Wealthfront for taxable account.
Tax loss harvesting only makes sense if you keep on buying and selling multiple funds/products. Hold only one index fund, hold it long-term and the problem vanishes: all the gains are not taxed until you sell the fund and they are always net of losses. Not to mention the massive benefit of deferring taxes in a compounding context.
It worked pretty well for me in 2016. I was up ~11% total and about to deduct about 6% in losses.