The market is giving everyone an opportunity to buy at a more cheaper rate...
I like this approach.
I will prefer DCA to lump sum. I only encourage lump sum when the market is really down and that is during bear market. But during bull market I do not advise it at all. I also prefer to advice people not to DCA blindly but that they can wait until a price is reached before they DCA instead of doing it weekly.
You can do DCA (Dollar Cost Averaging) regardless of the price if you've done your homework, studied the asset you're buying, and know it's a top-quality asset. Although, as you said, downturns can be ideal times to buy more than usual.