Yes, we know investing in DCA method is much less loss and less risk. However, if your friend makes such a comment, there are some similarities between trading and gambling. Because if gambling is played a few times then there is a possibility of becoming an addiction, and later on you will be interested in gambling, just like if you start in trading then you will be attracted to trading later, in that case you will lose money there. As we know, investing in Bitcoin is the most profitable compared to trading. If you start trading then start in bitcoin it will not let you face loss, but you will get profit from here especially use DCA it will help to reduce risk all the time. We know it's always better to use DCA as a smart investment.
Nothing links gambling and trading in this thread or even near to DCA. All these are separate entities which should be defined in their own ways not anything related to Bitcoin investment.
If you start trading then start in bitcoin it will not let you face loss, but you will get profit from here especially use DCA it will help to reduce risk all the time. We know it's always better to use DCA as a smart investment.
It's an unhealthy advise telling someone to stick with Bitcoin when trading, deciding to trade with Bitcoin or any other cryptocurrencies issues same losses, nothing distinguishes the risk management, it all goes down to how the funds is being managed, using Bitcoin to trade does not stop you from losing as well. Anyone who is scared to lose should be focused on investing their funds in Bitcoin, either strategies are okay depending on the individual balance and how he understands the market.