Then, we accepted to face the fear as being ready to accept whatever outcomes out of it by Investing with what's affordable to loose.
dont live with the mindset that investing is to have the fear of investing with whats affordable to loose.
instead have the mindset to invest with whats affordable to live without long term
fiscally its the same amount of money invested, but the mindset change affects how you treat your investment
when you have the "affordable to lose". people end up doing stupid things like gamble or take stupid emotions as reasons to cash out at the worse opportunity
however when you have the "affordable to live without", you instead dont want to make bad sell-at-loss risks. and instead are more happy to just hoard and wait for the right price
too many peoples mistakes are to invest funds long term but know they might need to extract those funds early and at a bad price because they put all their eggs into one basket and not protected themselves from the temptation to cash out when life events occur
too many peoples mistakes are to treat investments as a loss so it doesnt mater to them when they trade, thus make bad judgements and increase the risk of loss and just accept it as the inevitable that they would lose
..
in short a simple mindset change, helps protect you from bad choices
In a way, affordable to lose and affordable to live without are the same parts of one coin - people just understand it differently.
When I say, "do it but only with the funds you are okay to spend" I do mean what you said in the second part of the post: to do it without the hassle of cashing out too early due to a need for money on hands or because the hands of a person were shaky because of some different reason.
So I do agree with you - others should always remember that market is fluctuating and in order to gain something from it - one should have the knowledge and faith put into the thing he does.