Yes I have done DCA strategy in bitcoin from more than 1 year back. And this is what I think we don't have to be in panic because it is the best risk management strategy.
Yep, DCA is a quite safe strategy. However, you need to apply it on the right time to make it a more effective. If you apply it now, I'm not sure it will be quite safe because we are heading the bearish season after this bullrun season. So, as long as you know the right time to apply DCA, you shouldn't panic to see the market change nowadays.
I think that no matter what the market situation is, it would be nothing but foolish to abandon the Bitcoin DCA strategy and adopt an altcoin DCA strategy.
Applying DCA can be good for Bitcoin and altcoins, but it should be in the right time (I've explained above).
By the way, Bitcoin is the priority of each person. So, everyone should continue Bitcoin DCA whenever it is the right time. Even they do altcoins DCA, it is just an alternative for sure.