Because then you're beholden to another country, which may be hostile to your country, and their money printer.
With Bitcoin, no one has control!
With Bitcoin, no one has control!
Well, until a little over 50% of the miners decide they don't like you.
Ethereum's fork proved "no one has control" is an illusion.
The 2017 Bitcoin scaling wars proved that one can't simply change Bitcoin's consensus rules by majority control of the miners. I think at one point 80% of the miners were in favor of large blocks, yet they didn't have buy-in from the rest of the network participants (developers, regular users, merchants, exchanges).
Bitcoin has really robust decentralization.
The ETH fork happened before the people on HN were even following cryptocurrency happenings.
That's how early in the project a fork was done — the project would never survive another at this stage of maturity.
And everyone knows that.
So stop repeating it?
The fork stuck because it was still an alpha, as far as society was concerned.
It's currently in a grey area between a social movement and a FOSS project, and it simply started as a FOSS project.
I think it's important to characterize what occurred with this context. Devs won't get another chance at that without the project (and movement!) ending — and everyone knows it.