Your statement is limit supporting what is wrong under the disguise of freedom. In Bitcoin investment, you don't do the wrong thing and say that everyone have the liberty to do as they please because you will just run into problems. The essence of threads like this is to teach people the right thing so they can do better and be happy in the future.
The right thing is to buy Bitcoin with only discretionary income so that they will not be under pressure to cash out all their Bitcoin at any time. If they sell all their Bitcoin, they will run out of Bitcoin thereby defeating long term hold which is the recommended way of going about Bitcoin. If you have no discretionary income, then it is time to find a job or look for way of improving your finances before thinking about investing in Bitcoin.
Not all Bitcoins should be sold up on the way up, because, yeah, clearly, more would be lost than achieved doing things like that: however, making mistakes, although they can be avoided, is the best way to learn and remember what was done wrongly.
And, sure, a stable job and income mean a stable investment process.
You don't necessarily need to sell anything from your holdings if you are still in your accumulation stage because by thinking that you can outsmart the market is unwise, because by selling some of your holdings for minimal gains, thinking to buy back when it dip you are practically selling off most of your future revenue for peanut today which will make no much difference on your finances now, and you may never buy at that dip you thought you might get, so it's a move that should be avoided by all means.
Take note that am not against selling or taking profit from your Bitcoin holdings, but let it never be done when you are still in your accumulation stage.
Selling part of one's holdings while still making accumulations will slow down the accumulation process and make one not to meet up at the time they targeted to reach their level of accumulation and nothing weakens an investment to when you are investing and still removing part of it, it kills the morale of an investor because it will just look like the more you are trying to go up that is how you are falling backwards. Image someone like me that counts the amount i put in my DCA every week, let's say for instance i have accumulated like $500 worth of bitcoins and my target is to reach $1000 in the next 3 months and i already have it in mind to fulfil my wish but along the line i now removed like $200 from the one i hodl which means before i will accumulate that $1000 will now take me 4 months instead of the 3 months i bargained for, so it doesn't make any sense at all.