Although we all know very well that bitcoin has a strong foundation and shows strong promise of continuous good performance, It is important you know that your investment into bitcoin has no guarantee, same reason you are advised to invest into it what you can afford to loose so that at worst, you would only loose 100% of what you invested into it.
Since you already know that bitcoin has a strong foundation and shows Strong promise then why are you still finding it risky to invest with a higher amount? Even if you can't take such risk there are a lot of guys out there who are risking big in this accumulating journey, if you're talking about investing with what you can afford, then why is it that most guys always struggle to get to the status of overaccumulation? Seems you're mistaken bitcoin investment to gamble or trading that one is advised to stake what he can afford to lose, but you should know that bitcoin is not even related to this.
I don't mean to argue with you on the fact that bitcoin investment is not guarantee, but the word (investing with what you can afford) is not considered necessary here. I think this advice can only benefit those whose intention is for short term profit, since they're going with the wrong approach. However, With the DCA method a guy can decide to go with any amount which he know that he can be able to put into bitcoin either weekly or monthly until he get to a point where he feel like the amount of bitcoin which he accumulated is enough.
The advice to invest what you can afford to lose is still very important when you are going into Bitcoin investment, if you must know investing what you can afford to lose is simply talking about using only your Discretionary income to invest in Bitcoin, one can afford to lose his or her discretionary income and it won't affect him or her that much but using money you want to use to pay bills to invest in Bitcoin, surly you can't afford to lose that.
I see this your write up very disturbing because it may mislead a lot of newbies, because you are indirectly saying one should not use only money he or she can afford to lose to invest in Bitcoin and those that use it are still scared of Bitcoin, now let me clear you on something if someone is investing on Bitcoin using the DCA strategy to accumulate Bitcoin weekly or monthly he or she is suppose to only use money he or she can afford to lose from his or her salary which is also his discretionary income to accumulate weekly or monthly, if you decide to use more than the money you can afford to lose meaning above your Discretionary income you will get yourself into a financial problem that will lead you to dip hands into your Bitcoin investment, so please I will advise everyone to always use money he or she can afford to lose to invest in Bitcoin.