However the idea of "going all in" can best suit people that have understood the market navigation and have the good financial muscle to invest and hold, at this stage they've taken all precautionary measures to reduce their losses and increase their gain.
No amount of understanding, mastery, experience and what have you is enough to justify the decision of going all in. It is a bad concept that does not always end well. Most people that lost money to Bitcoin or other coins always go all in with money they probably have other use for. When the profit is not forthcoming, they are forced to sell at a loss because they went all in with money meant for other things.
Like many people have already said, investment fund should be separated from funds for basic needs thereafter emergency funds should also be kept for optimal management of the investment portfolio. This way there will be no pressures to sell even if the price drop because there is the confidence that Bitcoin will always recover with time.