A minor benefit is that references with words like "this" are less ambiguous when gendered, and you can unambiguously reference multiple things as long as they have different gender
The gender is part of the word. If you don’t know the gender, then no, you don’t know the word.
There is no way to compute that “dog” begins with the letter “d”, even if you know that the remainder is “og”. So should we ban words that begin with “d”? Of course not. In German you must memorize “der Hund”, not just “Hund”, just like in English you must memorize “dog”, not “_og with unspecified first letter”.
On a more serious note, it's a backwards compatibility thing. Taking a language with grammatical gender and removing it changes the way it looks and sounds rather drastically - more so for some than others. Needless to say, existing speakers are unlikely to appreciate it even if they don't care for gender qua gender.
(See also: numerous polls on how native Spanish speakers react to "Latinx" etc)