As a junior dev, who mainly works with C#, wf improvements are they talking about? I always thought that C++ is way better for when performance is important, like in emulation. At my company, the seniors keep talking about how we should move away form .NET to C++.

Not an expert, but I assume Bottles would be a good idea. It allows you to create separate wine prefixes for each app so if any app is malicious, it shouldn’t affect any other one.