Except, when I define templates code I need to handle classes that haven't defined <=>, and it isn't automatically created. This is, to me, the biggest problem

Except, when I define templates code I need to handle classes that haven't defined <=>, and it isn't automatically created. This is, to me, the biggest problem with c++. Some stuff would be great if it had been there from the start, or you are working a code base. Which can require all code (including all libraries) make full use of all modern c++ features. But new feature, in my experience, never stop you having to handle older features.