When it comes to bitcoin investment there are things that are important to have and one of them are reserved funds, like you said it helps one when there's a dip, when you are using the DCA strategy and you have also built a very good reserved funds it will help you accumulate more Bitcoin than someone who is just using the DCA strategy without any built reserve funds.
Reserve fun is very important but not to be use the way you are saying because every investment strategy has there advantage and also disadvantages and any wrong decision can result negatively on your investment, so your reserve funds shouldn't be a strategy for investing all in any Bitcoin dip because doing that can result to the disadvantage I'm emphasizing on, so actually I don't really see any risk on Bitcoin holding but most of the people are the ones that's bringing the risk to themselves because if you're accumulating with the normal method without adding any greed I don't think there would be any regret but the ideas to navigate into other method in other to stack more Bitcoin has always brought setback to most people.