I know diversifying is good but not everyone can diversify their assets and prefer to hold than trade it. The article was just nothing but just posting how he manage to diversify and profit by it. So yeah personally, I'm lean for just holding bitcoin than having a lot of altcoins when I know that I can't manage tho.
I dont like diversifying my investment because you'll only gain a little from it i like investing my money as a whole so you can have big returns. But if i have the funds to invest i'll invest it in two strong currencies with good fundementals and still progressing and gaining revenue overtime that is BTC and ETH.
You're on the right track dude. Like hello, we know our capabilities and if you know you're not good at that then just stick on your positive sides and trust on it.