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I personally don't see the reason for creation of lots of hard fork, there should be option of a soft fork like how lightning network was implemented in btc.
It seems to me that it is not entirely appropriate to compare the bitcoin and Ethereum blockchains. Ethereum is a representative of the next generation of the blockchain, and here it is sometimes impossible to do without hard forks (to implement basic network updates).
By the way, here's the countdown timer to Constantinople:
https://amberdata.io/blocks/7280000