This is why I have no problem with Steem as not only my largest cryptocurrency investment, but my largest investment overall. Like you said, why not invest most into the blockchains you use most?
It's a tricky balance between that and diversification... That's actually a big struggle for me as a whole, I spend 50% of my writing time on non-steem projects, even though they're way less fulfilling and earn similar or less money, just out of diversification. But maybe patience is the key.