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from my own perspective focusing only on one investment like bitcoin is not really a good Idea, because bitcoin is not a get rich quick scheme where you will you centralize all your focus investing on bitcoin alone and forget about investing in others things to improve your source of income to be able to sustain yourself till you bitcoin portfolio is do for harvest, remember it takes time to build an investment portfolio, so why not spread your money across other investments to improve your source of income to enable you accumulate more bitcoin consistently and hold on to your bitcoin investment for long term to make reasonable profits...
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It is obvious you fails to understand the reason for diversification. Diversification is not a means of acquiring or making more money but rather the purpose of diversification is to reduce risk by investing in different assets. I don't really see anything wrong with the idea of investing in bitcoin alone more especially if one don't have the financial muscle to diversify or spread his assets across different investment in other to reduce risk