Really good points again. I have to say, coming from the crypto market, that the similarities between gold/silver and BTC/altcoins are quite sound. In short: BTC, as gold, is king and everything else pales in comparison, but there's one reason why many people tend to buy other small-cap coins: the margin of growth or the extra gains you can get relative to those you would get buying the same amount in BTC. But the real problem in the case of PMs is of course the size of the stack.
I bought 1 gold coin (say 2000$) and 15 silver ones (say 500$) and while I was thinking how much easier it would be to buy more silver every time I have few hundreds euros left (instead of 'saving for a gold coin'), I immediately realized what a pain it would be to keep storing all that silver for years if not decades to come. And all for what, a possible (totally not granted) extra gain over gold? I don't know, but I probably like that gold coin a lot more than those shiny 15. I'm not regretting anything, but I won't be carving my walls out to fill em with safes to fill em with silver. Which is a pity to be honest.