Why explicit better thatn implicity?

Question

dear friends
why explicit variable better than implicity variable?

Answer 1

No there not the same. You should use implicit variables only for read-only purposes, see

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/anonymous-types.

I guess there would also be a memory allocation issue. If you are going to use a var where you could use a sbyte ... , wouldn't that be just wasteful.

Conceptually, c# is by design strongly typed. Can we hence deduct a better performance if we implicitly type the variables? Looks more probable. Especially considering why that choice was made:
https://en.wikipedia.org/wiki/Strong_and_weak_typing