For me, its time consuming if we use the excel type of monitoring, blockfolio offers the simplest way to tract your investments, so why not focus on the easiest ways, well i could not argue your method but ive find it very redundant to monitor and update everyday your excel file. Meanwhile, excel is the safest form of monitoring, compared to digital ways, but its up to you how you can access your portfolio in your best possible ways.

Have a great day