I'm not misunderstanding anything here. What I've mentioned are real risks of holding altcoins for a long time. You can have your own definition of what long-term investment means according to your understanding.
there is nothing wrong, indeed in a long-term investment there are many risks that might occur to us. especially for altcoin assets. even the top altcoins cannot be predicted in the future. like a market situation that we cannot expect. who would have thought that ethereum was only moving slowly like now even though bitcoin was moving fast? that's just a small example of the risk of long-term investment.