You're wrong, actually when the government regulated Bitcoin, it will help adoption and encourage their citizen to use Bitcoin since they're already know government is allow them to use Bitcoin.
You can't say he is wrong, everyone has the right to choose to have privacy or not, although most people do not care about KYC, but some people still care about it and trying all their best for their coins not to be linked to their real identity. Some people even have the privacy part and another for KYC, and making both not to link.
Am not really sure what you mean to remain decentralized, because there's no such thing but many people want to protect their privacy.
If there is no decentralization, how can privacy be maintained? Bitcoin remain decentralized, but the government are looking for more ways to make it centralized with the help of centralized exchanges, but bitcoin itself is decentralized. Exchange like Bisq is also decentralized.
Using decentralized exchanges will avoid centralized exchanges to collect our KYC, but if you not using mixer, chainalysis can still track your coins and address. So you need to use both decentralized exchanges that run with Tor and mixer e.g. Chipmixer.
You can also still convert bitcoin to monero and back to bitcoin on a decentralized exchange.