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.
Trading is generally risky but bitcoin trading is better. Altcoins are easily manipulated. Let me show an example
See how this coin was manipulated since 3 days ago.
When we are talking about Bitcoin it should be Bitcoin long term investment and not some trading stuff as Bitcoin is never a tradable coin.
It could be misleading when you say Bitcoin is better when trade, Bitcoin shouldn't be trade but invest for a long time purpose, with the DCA strategy of accumulating Bitcoin an investor can buy small small either weekly or monthly and hodl for a longer time and not to trade for a short time interval, an investor who accumulate Bitcoin and HODL for 4-10 years and above will definitely not regret trading or selling out his Bitcoin in a short while, as an investor our mindset should always be accumulate more Bitcoin and HODL for the future.