Bullshit, You're approaching this from the perspective that anonymity is a primary feature of signal. Security and privacy are the primary features and they are different from anomonymity.
Encryption is not a crime.
What's more, Signal has usernames now, and you have the option to ensure your phone number is not able to be discovered even if someone has it in their contacts. So your entire premise is moot.
Re-read what I wrote. The new username feature doesn't make it moot.
I don't think you understand how the new phone number privacy features work. It's possible to register with a phone number and have it not be visible OR DISCOVERABLE by anyone.
No, you don't understand what I'm saying. I'm not talking about your Signal contacts. I'm talking about other people who have your phone number saved in their contacts (the one people use to make phone calls from, not from Signal) and have used other services that have uploaded those contacts.
Exactly. If you don't want those people to know you use Signal you don't have to. Look up the recent update to phone number privacy. In fact I just took this screenshot: 
Nah, not that either. You're still missing my point. If a contact (friend, family, etc) outside of Signal has your phone number saved with your real name, and you use that same phone number for your Signal account, and your friend/family use a service that uploads their contact data with your real name/number in it, then they have effectively doxxed you as the owner of the Signal account to three-letter agencies.
What you're describing is the simple concept of a social graph. Those three letter agencies could gain a list of contacts for who knows who from services like Google, but if you have PNP in Signal set in such a way where discoverability is set to no one, how would even the three-letter agencies know that you're using Signal?
