I don’t have strong opinions on actionable recommendations, but this is definitely an area that needs more exploration. The real world is rarely as straightforward as binary decision making.
One example is someone working at a startup, building equity in the form of stock options. It makes sense to save in a better store of value than USD, so accumulate by DCA is straightforward there. If the startup does well, there may come a time to exercise the options and turn them into shares of the company. This could easily cost 6-figures USD, but the potential gains could be an order of magnitude or more.
One option is to market sell the amount of BTC estimated to cover the strike price and taxes (for both the options gain and BTC sale) but that could easily cost far more than a less naive strategy.
Obviously many factors are involved… current BTC price, recent market activity and sentiment, current stock price, expectation of when a liquidation event is likely to occur, etc
So yes, save in Bitcoin, but eventually spending at least part of that savings is the ultimate plan. Sounds like you’re working on how to analyze this aspect of Bitcoin investing, and I look forward to your results!