(This is just my recognition, so might be not same with true history. But I think there's not so big mistake.)

Historically, mixing function themselves and function addresses had introduced huge confusion for non-expert C programers.

Not to repeat the mistake, D completely distinguished the two at the syntax level - func and &func.

Fortunately it has introduced a good feature in D - when we use the name 'func' without & operator, it could be interpreted as a parenthesis-less function call without ambiguity.

In D1, the feature was widely used.

However, the feature has a corner-case issue. If func returns a callable object, function pointer or delegate,

does 'func()' mean either "call of 'func'" or "call the callable object which returned by calling 'func'"?

That was particularly important problem for the Range.front API design in D2.

To fix the issue, @property attribute has been introduced.

At least to me, your argument is just to return to the C era. I think it will introduce huge 'regression'.