Diversification is for people who don't know what to invest in. If you did your research and decided to put money into a project, it's because you know it will go up.
Otherwise, you're just a gambler, not an investor.
If having a 'portfolio' full of crap is your way of being a 'smart investor,' go ahead.
It’s not like you don’t know your investment well or you don’t trust the full potentials of your investment, but diversification is the safest and effective way to achieve profits from different potential sources. Although there’s no wrong if you focus on a single source and maximize all its potentials, but if you can diversify your investments well and see how huge your profits you’ve compounded, then it’s undeniable that the positive outcomes from different investments are always better compared to a single source of profit.