Bitcoin investment is risky just like any other investment but the risk is lesser and if you invested with a discretionary income, there is no need to think about the risk that is associated to it again since you can bear any aftermath of what comes out from your investment if things peradventure goes wrong
You thought wrongfully about it.
Invest what you can afford to lose is a very classic advice and by invest your discretionary income, you do your capital management better.
Risk is risk and it is nearly the same for your investment capital, and if you picked a wrong cryptocurrency for investment, you will have same 80% loss of your initial investment capital. Bitcoin is not like any other altcoins or shitcoins. So attributing it with the clause,
Invest what you can afford to loose is nearly disrespectful to the reputation of bitcoin. This statement also tend to refer to every bitcoin investor as Bitcoin Traders which is not true. Bitcoin traders gamble bitcoin and just like every other gambling, they can loose anything at any time. Buying to hold is the only way you can be assured of having a safe investment. Bitcoin market could fluctuate any moment and that is when panic sellers loose their money often times.
i think you are wrong, all risk are not nearly the same. lets hypothetically think of a person who invested in shitcoin or a person who gamble with some altcoins and a person who invest in bitcoin, the risk can not be the same. even as people classify bitcoin as a risk asset, there is never a prove that it is as risky as they claim because as far as i know, bitcoin has been doing pretty fine for a long time now despite the volatility but we have been moving from low to high gradually and yeah nothing is stopping that. people only make reference that bitcoin might even fall to zero because it might lose attention and adoption for another asset someday and it might reduce in value since nothing is permanent, but all this are just assumption or insinuation but i dont think that will happen anytime soon. but that shouldn't deceive anyone to think that bitcoin is as risky as they thought. from the track record of people who have bought bitcoin and held right from the concept, there has never been a scenario where people regretted. the only people i see that complain are the traders who usually paint bitcoin black due to their impatient of not hodling for long.
The fear of the fact that nothing is permanent is also wrong because no matter what happens, there will always be currencies. As long as humans exist, there will always be a medium of exchange so I don't see that statement as worth dwelling on.
About loosing credibility, bitcoin is already above 16 years old and has always been on the way up. Every day bitcoin get larger acceptance among various groups. Bitcoin is designed for a long-term credibility. The fact that it is not like any other central bank note which could be minted endlessly with a total possible limited supply of 21million has stabilised it already. Not subject to devaluation and not also very prone to external influence.
With nations accepting bitcoin and also creating bitcoin reserves, I don't think bitcoin would loose credibility anytime soon, at least not in our generation or next.