Default visibility for type members is private, default visibility for not-nested types is internal.
Defining implicit cast operators frequently (especially ClassA -> ClassB) might be a sign that a better implementation is required. In practice, it's not done often.
Agree on unncessary Async suffix. It is a common mistake (it is one) to add it for methods that cannot or will not offer non-async variants.
In a sense, internal is just another way of viewing it as “private to the assembly”. If i don’t need something to be reached by another assembly, then typing `internal` when not necessary is just too much.
Defining implicit cast operators frequently (especially ClassA -> ClassB) might be a sign that a better implementation is required. In practice, it's not done often.
Agree on unncessary Async suffix. It is a common mistake (it is one) to add it for methods that cannot or will not offer non-async variants.