[tgjsrkghruksd]

The main problem is that TLH is irrelevant in tax-free/deferred retirement funds, which is where you should be sticking your savings if you haven't maxed them out, which is the situation of most people who use these robo services.

[mendelk]

Yet another problem of TLH is that you must have all your investments with Betterment to ensure you don't trigger the "wash sale" rule. (Alternatively, you can handle it yourself manually, but that negates most of the benefit of having Betterment from a TLH perspective.)