Bnb is good it is also very useful coin, but investing on bnb alone can make you bored, i think investing on some new fast moving coin and btc is more great than investing only on bnb, i believe that if we invest on different coin there is also a different excitement when we look or check the price on our portfolio.
atleast we have more than 3 altcoin in our bags, diversify will make our investment has less risk rather than put our money into one basket only. beside bnb in market we also see alot potential coins such as Coti , One , FTM, RSR and many other. we will also have chance get more profits when spliting our altcoin , maybe some of them will pumped and another one stuck or even dumped.
I agree it's better to split our capital rather than put it in one basket so when the other dump we can rely on the other one but keep in mind that the one we should invest in is a project that has a lot of potential so the chance getting scammed is little. Do some research before investing, use your money that you can afford to lose so when the dump continues you can feel a bit relaxed.