So - instead of doing a little work on your part you are forcing others (in most cases people that you DO WANT to communicate with) to jump through the hoops so they can communicate with your? In most likely event they will give up on the attempt and marketoids will simply find a way to circumvent the protection.
Again - you make it seem like it's gigantic work to keep your inbox tidy. Last time I had to click unsubscribe was months ago and it happens like 1-2 times a year - is that too much work?
I've addressed your points in more detail in other comments. A summary:
1. If someone can't be bothered to spend a minute in their whole life to be able to communicate with me, it's a pretty strong signal. I've had plenty of people who imply they want to communicate with me, but then are very poor responders to my emails. A hoop filters those people out.
2. No one has complained. If anyone is annoyed, they just ignore it and I'll whitelist them anyway when I see their email.
3. Marketers will not invent a way to circumvent it, because it's too much trouble for them to. I'm not that important.
4. Keep in mind the system has been working for over a year. This isn't a proof of concept or something in my imagination. Furthermore, if you read the other comments, people are paying money to have this feature.
5. Just because you don't get annoying emails doesn't mean others don't. Roughly half of them are unsolicited (I did not request to be on those lists). I think more likely is that the automated emails you do receive are ones you want. Whereas I don't want any in my Inbox.
My final point: Given where I am now, what possible reason would I have for switching to your workflow? Your stance comes from one who has a "default" position: the status quo. Look at it from my side - my system is working, and is very low maintenance.
Again - you make it seem like it's gigantic work to keep your inbox tidy. Last time I had to click unsubscribe was months ago and it happens like 1-2 times a year - is that too much work?