Edited out
I would agree that buying each and every time on a specific timer (one a week, half a month, or a month) is beneficial to a person, rather than just waiting for a dump to happen (because it may not) because of the facts you and many others here talked about.
Yeah, That's it! using the DCA strategy of buying doesn't eliminate buying of DIPs but instead it covers beyond... Either the market is in a Dip or not the DCA strategy doesn't focus on that so you can buy dips or buy outside dips using the intervals you mentioned which is a good way of investing.
Think of it like this buying of dips is like a bonus to your investment, if you still have some disposable funds after considering your DCA and other necessary stuffs then buying dips with such funds can be a bonus for your investment.
You have to plan in such a way that you use your money to buy bitcoins using the DCA method, and you buy dips with more extra money. There is sure to be pumping and dumping in the Bitcoin market, so you must plan and split your money.
And keep funds close to perform regular DCA procedures, and be prepared to buy dips in the Bitcoin market so you can buy your Bitcoins from both sides and hold them for a long time. Make a plan like this and convert it into reality then surely you will be successful in holding Bitcoin for a long time.