DCA should be in the basic strategy of every investor to accumulate more bitcoins to what they have. Lump sums for investment will not always be available, and if you choose to always wait to invest lump sums, because of how long you may have to always wait to get and invest the lump sum, sometimes someone who is a committed DCA-er and DCA-ing reasonable amount regularly would have accumulated more (Not in all cases though, as it depends on the amount of lump sum and amount used in DCA).

If you invest Lump sum as well, you will have your attention a lot focused on your investment. You will not be a relaxed investor, unless the lump sum invested is still an amount you can afford to loose, but not always so.

DCA as an investor in bitcoins, but also be flexible enough to invest Lump sums at intervals if you can. The goal is to get more bitcoins, any legal way to accumulate it is accepted.