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You have detailed everything, but many people who buy and hold for a long time do it because it is more profitable instead of day trading that can bring losses and another important factor ia that are people who have lots of money, they do not need the money they invested long-term
right now since long term holding is little bit pathetic and cannot be trusted anymore due to scam alts entering the crypto market.
investing in altcoins has become much more risky
But let's assume that top 50 on market cap is the best right now but we still need to be cautious since anything might happen.
they are always changing, and there is a lot of altcoin that does not have a great use in real life
because as you can see all you have to do is to invest and keep it in the wallet while waiting for years if the coin is become successful.
this works if it is with bitcoin, with altcoin the is another story, we always have to be following the news about altcoin because you never know if you can open your wallet after years and discover that your altcoin is worth nothing