It seems that you are getting DCA mixed up with other kinds of investing (such as lump sum investing), because DCA overcomes each of those items in your list because once you get started, then DCA makes it easy to overcome each of the items, because all you need to do is pick an amount.. $100 per week set it and forget it..... and if you think that $100 per week would cramp your lifestyle too much, a different amount could be chosen.
We can determine the amount that can be allocated for DCA needs based on weekly or monthly income, at least an investment allocation of $30-50 can be reached by all economic classes for the lowest amount to realize the DCA strategy per week.
Even though this figures are realistic, to truly demonstrate the power of compounding and little beginning, we could go as low as $10 per week and spread it over five years. This will achieve the same result and the person performing the DCA will not even know he was spending money on anything... his lifestyle, expenditure and everything will be going smoothly, without any financial stress meanwhile he will not even know he is making futuristic investment that can even be his greatest achievement.
If I want to teach somebody about Bitcoin and how to start investing in it, I will simply teach them to apply DCA with as little as $10 per week. Irrespective of the social status or the asset class, this is feasible and affordable and there is high chance I will be able to convince the person instead of telling someone to invest huge amount of money at one.
Like it has been abundantly emphasized here, the DCA method is truly the game changer for those who want to make maximum use of the opportunities offered by Bitcoin, it handles all the psychological hindrances that many people face in Bitcoin accumulation and management.