If you have disposable income, then there is no need to wait... but if you do not, then maybe you have to wait until you do... yet I would not presume that a person has to wait merely because his/her disposable income is small, which seems to be what you are saying in a kind of dumb-ass, repetitive and stubborn way.
An individual with a disposable income even if it is small can invest that comfortably into bitcoins with less pressure.
sure your level of aggressiveness is a choice, yet your earlier blanket statement that investing into bitcoin does not contribute to giving anything up seems to be factually wrong, whether a person is investing whimpily or aggressively, and even if he ONLY invests $10 per month, he is still giving something up by dedicating that amount to bitcoin rather than buying a couple extra cups of coffee... or however he might have chosen to otherwise spend or use or save the $10.
I agree because to the two sets of people, the one who is investing aggressively is given what he can based on their disposable income, and the small investor investing little based on their disposable income, are both giving something that has value to them, it is a sacrifice, because they can choose not to as well.
It is better to take the investment journey in a relaxed manner without forcing all their money to be in bitcoin.
Who says? People can choose their own level of aggressiveness, and yeah they can structure their investment into bitcoin so that they are not stressed, but they don't have to.. The level of aggressiveness or whimpiness is completely discretionary... which means each person can choose and such person may or may not have regrets later over how they choose to go about their level of aggressiveness of their bitcoin investment.
I would say that you choose your level of aggressiveness based on the results that you want. If you Intend to invest and really benefit from Bitcoin you need to be very aggressive about it because you want the best results, but if you are okay with any outcome for your investment, wimpy investment is better than no investment.