Bitcoin maxis will tell you it doesn't apply to Bitcoin. In fact, if anything, that all eggs should be saved in one Bitcoin basket by buying and hodling only Bitcoin.
In a related development, saying traders shouldn't be greedy is like saying humans shouldn't be humans. Greed is the nature of humans. What makes greed an issue is how we control or allow it control us. As a trader, you will want to get more off the market whenever an opportunity presents itself, factoring in the fact that the market is merciless when dealing with traders. It's not a bad thing by my books, though, to get back at the market if we can. Nevertheless, one has to be careful in doing that so as not to get very greedy. Like we were taught in the drama Macbeth that being ambitious isn't a bad thing but that being vaulting ambitious is a problem.
I am a bitcoin maximalist and I never tell that to anyone. I just tell them to DCA their way into crypto and never put anything in one basket. Sure, I believe bitcoin will be one million dollars one day, not anytime soon but in the future, but there is no reason why you shouldn't make most of your investment.
It means if you invest a bit now, and if it drops then you will invest a bit there as well. I buy bitcoin once every month when I get my salary, and that is how I grew it bigger and bigger, sometimes it's lower and allows me to get cheap bitcoins, sometimes it's higher and I increase it, but I keep buying it, instead of going all-into bitcoin.