Personally, I do not like ideas of "going all in" to investments...
To me, it sounds like gambling and or trading rather than investing.
Even though I get the idea that reserve funds can be saved up in order to have extra cash that goes beyond regular DCA buying to be able to inject into your BTC investment at various points along the way, especially at various dippening points.
You are right but investment is now the only way to be profitable for everyone, trading or gambling without experience is not very profitable, if one invests in Bitcoin now, it is almost certain that he will be in a profitable position within a few months.
Also as per your suggestion if one trades and gambles intelligently then more profit is possible, but most of the wise people can't do these things by following the right rules.
Maybe I will slightly agree with your idea that investment is a profitable place, but I will underline that investment is not the only profitable place because we cannot rule out other places and also "this place will not always be profitable" meaning that the possibility of risk will always be there for you, But most people are too optimistic with the idea and belief of "profitable" which in the end instead of getting the desired benefits but what happens is just the opposite, namely they experience / suffer the number of losses, yes I understand that not everyone always experiences things like this but this is only for those who come because they are too tempted or who only see in terms of profit so I see not infrequently from those who come to get involved without bringing the right understanding and planning about the world of investment.
We must understand what we should understand about investment that after all this is an activity that gives us the opportunity of profit and behind it there is also the possibility of risk, therefore we cannot just assume that investment is "the only place to be profitable", so the point is that if for example you have the right understanding along with good planning and risk management then I will be able to confirm that investment is "one of the activities that can give you profit".