If you ignore the incumbency, the regulations, the training requirements, the retrofitting, the verification, the international coordination, and the existing unfathomably reliable systems built out of past tragedies, then sure, it’s "simple".

Those are excuses and encumbrances, not reasons. If they are so important, it leads to a question: what existing automated systems can we improve by adding similar constraints?

If these are just "excuses" and not "reasons," then explain how you have determined them as such.

I would like to say, "Because knowledgeable people have explained the difference to me." But again, this has come up before, and no explanations are ever provided. Only vague, reactionary hand-waving, assuring me that humans -- presumably not the same ones who just directed a fire truck and an aircraft onto the same active runway, but humans nevertheless -- are vital for safety in ATC, because for reasons such as and therefore.

There you are doing it in order to avoid engaging with the substance of what people are saying.

There is no substance in the replies. There never is. Only unanchored FUD.

The only difference between an excuse and a reason is the designator's belief as to the validity of the reason provided. You have already said you do not have the expertise required to assess validity, yet here you are doing it in order to avoid engaging with the substance of what people are saying.

If these are just "excuses" and not "reasons," then explain how you have determined them as such.