Again, you must be talking down the road because I see no reason to focus on anything beyond bitcoin and cash in the beginning, and then once you build up your investment portfolio, then you might consider something like land and/or maybe equities.. but gold? bitcoin serves a similar purpose as gold but better, so I don't see any reason to get exposure to gold unless you already have it then maybe you figure out if you are going to keep it. But getting exposure to gold seems like a pretty BIGASS waste of time and not necessary, unless you happen to live in a situation or location that people are already accustom in trading in it.. but that seems less and less likely these days... but hey, whatever. Guys can do what they like in terms of those allocations and when (at what stage in their investment life) they might allocate in some of the assets that are neither bitcoin and cash.
I agree with you, its better to be strong in one asset (bitcoin), than to have so many weak investments. If I have build my bitcoin portfolio at least to maybe up to 5 years of accumulation I can now start think of diversifying but this might be too early in some case especially when i have not accumulated enough bitcoin, I always wanted to have at least 10 bitcoin before I considered any other investment, but you have also told me I should be prepared for a case where my investment doesn't give any return, and till now I've not actually understood the lesson you are trying to give me in respect to this, I'm building up myself in terms of cash too and I'm still consistent with buying bitcoin with DCA.
It is actually not an easy task to choose a successful and profitable altcoin and doing thorough research seriously is the key. And everything they say here is true, but you also need to have serious skills that you can rely on to make the final decision.
And I think the most important thing is to analyze the team, are they all experienced and have a good reputation and do they have successful experience or a clear roadmap for the project at hand. Because if you can analyze all team members well, you can assess whether the team has good potential or whether there are suspicions that make you want to do other research as a whole to confirm it.