I guess there is a reason for you making this post, and in theory, I think that reason is okay, for a paper and pen work, with it having no real effect in the practical use and real trading market.
On the real world, outside the internet, every business person wants to purchase a goods in a small amount, and sell it higher when that goods faces scarcity, of which such commodity can remain or continuously facing a declination in its price for as long as possible, and on that, there can be some reasons of selling off, knowing well that it will not be facing recovery of its price anytime soon. In the crypto world, reverse becomes the case, when Bitcoin is the case study. No matter how the deep will go, Bitcoin over the years, since its first bull run, it keeps coming back, creating a new ATH.
If you speak of altcoins, then I will say there's some sense of reasons why buying deeps is not always the best, but not for Bitcoin. The best investment any crypto enthusiast, investors or even trader should take proper consideration of having some portion in his/her portfolio is Bitcoin, then any other coin can be packed up as well, with a lower capital of investment in the altcoins, while a bigger chunk of investment capital should be placed on Bitcoin.