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Take note that i do not keep any altcoins in my portfolio. There is no strategy that has proven to be successful in predicting altcoins, how can you trust some developers, when a lot of them have turned out to be scammers in the past, and if you are investing because an influencer recommends the coin, then that is a crazy thing to do. I agree with the point that you can get lucky with a few altcoins if you buy a lot of them, but what if you don't get lucky.
Not all altcoin are trash - some of them can also bring you profit. Just avoid most of the new altcoin created when the narrative is high like memes or AI - but of course I don't recommend you buy an altcoin if you're never convinced it can give you return.
Of course it's not a problem if you only invest in bitcoin - but anyone who diversifies their assets into several altcoin is not entirely to blame. I also own bitcoin and tend to be more confident in its future potential than altcoin - but I have a few percent of altcoin in my portfolio that I at least believe can give me return.