From my understanding through the help of this forum no strategy when it comes to bitcoin investment is free from lose, one can't say there's zero percent of risk in any strategy, when it comes to trading you can't say experience and understanding don't play a role in making one successful, I have a friend who is into trading after his training he started trading he was having more lose than wins but as time goes on he started winning or gaining more than he lose and he said experience helped him to get to that point.
You are wrong when you said there's no understanding that can make someone a better trader, you can't compare someone that don't know the basis of trading to someone that has a good understanding and knowledge about trading, those that has more understanding, knowledge and experience will always do better than those that don't have.
We all know trading is risky so as other strategy too, no strategy is 100 percent free from loss or zero percent free, and trading too those it's own part in Bitcoin so one can't tell people not to go into it one should only tell people about it's risk it's advantage and disadvantage let people choose there own part.
I am finding it difficult to understand what you mean by no strategy is 100 percent free from loss and I guess the strategy you are talking about are: lump summing, buy the Dip and DCA method. I think you are mistaking these mentioned strategy to trading strategy because the only period one can face challenge using these strategies I mentioned is when one mismanage their investment maybe investing what they can't afford to let go, not keeping reverse funds etc, can really affect an investor.
Experience is very important no doubt but when it comes to trading dude experience doesn't really work that much no matter the level or degree of experience you have in trading loss is paramount though it can help traders scale through so certain things that un-experience trader can't.
I think the point he was trying to make was that there was no strategy that does not have its disadvantages and advantages and not necessarily how he put it because the strategy with which the Bitcoin is purchased is not what lead to loss but how the investment is managed after they have been acquired is what shows the level of loss the investor will be exposing it to. We should not forget that losses in Bitcoin is only possible when we sell and it is completely something of choice to lose in Bitcoin because if you refuse to sell, your 1BTC will always remain the same quantity in your wallet. If you can just hold a little longer, the value will go higher and you will not be selling at a loss. This is the reason the investor must endeavor to buy with amount that can allow him hold longer and not be forced to sell at a loss.