yes. Crypto Trade costs affect portfolio performance, so the accuracy of prices in Fortopolio is sometimes not the same as prices on the market, but there are only a few differences, so I don't think that's a problem,
I think that regardless of the market prices, you can up to some extent minimize the risk of your assets in the portfolio so yes this is a fact that it is not a big problem but there is always a limit to the diversification.
there is a limit to the price diversification in the portfolio, so I always see my crypto asset price from the exchange directly, because if I look at the portfolio, I'm afraid the price isn't the same when on the exchange and makes my trade mess.