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I don't disagree with anything that you are saying surely guys might have some difficult times figuring out what there investment timeline is exactly, even if they might consider that they have a relatively long investment timeline of 4-10 years or longer.. or even 10 yers or longer rather than your example of 5 years.. but even at 5 years, there could be a concern about reassessment, even though no one should consider that he is so locked into his investment that he is not able to reassess and tweak from time to time, which also might be considering changing the amounts he is putting in and the timeline and other ways that he is managing his budget, and also if he might have some lifestyle considerations that he is accounting for that causes him to want to consider that he might start to cash out of his bitcoin in 5 years or so rather than allowing the investment to ride for longer.
IMHO is that we also need to think about the age at the end of the day because maybe it's okay to do it for the long term like a 10-year span or even more like you said but on the other hand we also have to think about the age that we have because after all the hope is that when we are in investment we want the best in terms of results to support our old age life .
For those who are still at a young age to a certain age which is certainly still productive, it is certainly not a problem to invest longer as you estimate but for those who come in a condition where for the next few years they will enter retirement time, a shorter period of about 5 years is not a bad thing because after all, in this case we invest , of course, we want to make our old age/retirement comfortable in terms of finance and do not need to think about anything other than enjoying the rest of the life lived .
As for in the end this is used or not it does not matter, the most important thing is that this must be calculated from the start so that we do not have to look for additional money later.
This is why an investor must have a discretionary income in which he can calculate from on how much he would be using to invest in bitcoin regularly either weekly or monthly, and also channel the rest to build up his emergency funds so that he can be investing and building his emergency funds in order to him to have full confidence on his bitcoin journey and hodli for long. Emergency funds are used for very critical case scenario like lost of job or the roof of your house got pulled off by storm. These must be fixed immediately to avoid for damage.
As I said in the article that you did not quote because after all this is an important situation if we really want well-maintained finances then we must try our best to manage it and indeed a reserve fund like this should not be missed for every month because when something is not wanted then indeed we can overcome without having to take money for other things in the monthly income that we have.
As for if the reserve fund is not used in the end it is up to whether it is used as an additional investment in bitcoin or something else is up to us later, the most important thing is that the reserve fund must be maintained so that when the expenses we have arranged but get an unexpected situation and have to spend additional money, we are ready with it.