Then you are writing bad C++ code.
The new features are added specifically because they enable writing better programs. Avoiding them means you are choosing not to write better programs. It is allowed, but not a thing to brag about.
That does not mean every program has to use every feature. But when there is a choice between the new way and the old way to do something, the new way is very probably better.
Passing a reference, where you can, is better than passing a pointer. Passing a lambda is better than passing a function pointer. New for-loops are better than old for-loops. A unique_ptr is a better member than a naked pointer. A compiler-generated destructor is better than a hand-coded one.
And so on.
