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I think that a lot of people like to consider DCA as a fixed dollar amount, and there is nothing wrong with that, especially since there can be a lot of conveniences in terms fo having a fixed dollar amount, whether weekly or some other period of time... set it and forget it kinds of ideas... though I also do not like automated DCA, even though sometimes automated could be way more convenient for people so they do not have to remember to do it, and they may well be busy at certain periods and forget to do their DCA manually.
Indeed the automated DCA do actually seem like an amazing approach as it simplified the whole DCA process and make it a lot more convenient, especially for those who often have a busy schedule and could forget to buy sometimes, but I still understand your reservations about the automated DCA, because despite the convenience it offers, it can prevent one from staying engaged and informed about your investment, which is really essential for the investment as need may arise to make certain adjustments.
Manual DCA on the other hand helps one to give the required time and attention to their investment and help them stay more connected and also make the necessary adjustments where and when required.
Although this isn't always the case, because even with the employment of the automated DCA, one could still find to to regularly visit his investments and still make all the necessary changes and adjustments when needed as automated DCA can only kick in when the investor is super engaged with other activities, too engaged that he either forgets or is deprived of the time to DCA for that week or month.