Yes you are right friend, but in my opinion it is not only the DCA technique that will make long-term investors in bitcoin potentially profitable, but other buying methods I think will be equally profitable if hodl in the long run.
DCA method has absolutely nothing to do with your future profit, is just a strategy meant for bitcoin accumulation this strategy is mostly used by those new Investors and also those that can't afford to buy in lump. Moreover some people feel that doing the DCA is less stress than buying in lump since DCA gives them the opportunity to buy with any amount, The only different between this two method is that a guy who is buying in lump is always faster than the DCA Guy that's depending on your weekly purchase, but that doesn't mean that a guy who is buying in lump sum will be more profitable than the DCA Guy. Moreover your investment goal May be different from the guy that is buying in lump.
It is true, DCA is just a buying strategy and I have also explained that it is not only with the DCA strategy that makes someone successful when investing in bitcoin. Because I have emphasized, that it is the long-term HODL that will make someone potentially profitable when investing in bitcoin.
In addition, if you say that DCA is mostly used by novice investors only, I don't think that's right. Because basically bitcoin investors who have been in it for a long time also use a lot of DCA buying strategies. So with that, I think your assumption may be incorrect in this case. And not a few people who are able to invest in bitcoin at once, decide to do DCA too. Because basically DCA is a scaled purchase which of course it will further optimize our bitcoin purchases.