This is a very risky assumption...

Take Ghidra as an example; it's open-source, too...
https://github.com/NationalSecurityAgency/ghidra/As for whether Samourai, Wasabi or ChipMixer are part of the FED; I don't think there's any way for anyone to know for sure.
I never said this is impossible, we know open source Tor is made by them, and some people even claimed that Bitcoin was a government agency project.
I can't be sure about anything this days and I am not trusting anything with 100%, open source or not.
nopara73 claims that they didn't remove the coin control feature but rather improve it significantly by making it fully automatic and insusceptible to human error and bad privacy practices. But if you think you know better what to do with your own coins and how to spend them in the correct way, you can still choose UTXOs manually using the "secret" combination CTRL+D+C.
Did you try using this secret combination to enable coin control in Wasabi wallet?
This is probably working in wiNd0ws and opening new window, but I am not sure if same combination is used in Linux and Mac os.
I know most of the people don't even use coin control, but more advanced users can't imagine a good wallet that don't have this option.