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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.
Two heads are better than one, I think that is also applicable when it comes to investment. It’s better if you still diversify your investments like putting some bigger allocation to bitcoin and investing into altcoins with an amount you can afford to lose. That way, when they both profits, you will gain massive profits from multiple investments.
While bitcoin can be highly profitable in the long run, altcoins as well can do the same, as long as you invest in the highly potential altcoins. That’s why in-depth research is a must, so that you can make good decisions towards investing of your choice, and won’t end up falling into the fake altcoins.