Yes, robo-advisors help achieve diversification with their asset allocation. This is agreed amongst all the replies. However, let me give an alternative perspective. While your investments are diversified by asset class through your portfolio, if you put 100% of your capital into 1 robo-advisor, what we have now is investment in only 1 medium. Therefore, what we can do to further diversify is to invest in (you guessed it), multiple mediums. While I noticed that most people on Seedly would rather do their investments on their own (RSP into ETFs, investment in robo-advisors, lump sum investment through brokerage, etc), I feel that having a portion of your money to invest through your financial advisor (endowment, savings plan, etc.) is also a form of diversification. While the argument is that by doing so, there is "unnecessary" incurred fees and also less desirable returns, most of these plans do also have a surrender value and mimimum guaranteed return. e.g. After your long investment horizon, you've reached retirement age. Few months prior to your retirement, the world experiences another bear market due to reasons such as another pandemic. Your self-invested investments are at net negative (worst case scenario) and you've wasted the x amount of years of investment. If you had investments in an alternative medium (your FA), you would at least have a guaranteed capital amount in the form of matured product that you had bought which you can now use for said retirement. Hope this makes sense. Just my 2 cents.