I like the DCA approach - it's definitely much better than a lump sum. DCA is Plan B what I mean - it comes in handy around the clock on highly volatile assets like bitcoin.
Sometimes DCA is more useful than a lump sum, but sometimes not all at once. I only do DCA if bitcoin is on a downtrend, but if at the same time I truly believe that lump sum is better, then I will ignore DCA. I agree that so far DCA is more useful, but when the bullrun starts, buy the lump sum and hold.
It doesn't matter how you plan your long-term investment, as long as you are a holder, even without DCA you can still expect returns.