Are you deliberately trying to troll me?

Look man, you either completely misunderstood (my bet) or purposefully misrepresented what notabot said, and all I did was come here in good faith and try and explain it to you. You have, for 3 days now, completely missed it, and pointed out that back-end enumeration mitigation isn't the specific feature you're complaining about.

I never once said that it was.

The only concept I've been trying to communicate to you, through my own frustration, is this:

On a simple login endpoint, if there's bits of information that differentiates one scenario from another, then you have provided a vulnerable surface that can be abused to extract information.

It doesn't matter how likely it is.

It doesn't matter how hard it is.

It doesn't matter if we're talking about an embedded device, an api endpoint, or a database server.

It doesn't matter if that information is a response code, a failure message, or a response time.

If youre responses are differentiable based on enumerating the possible inputs, that leaks data.

I'm aware that has nothing to do with showing you a pretty little message. I just wanted to be a source of information for you.

I have been patiently explaining the core of the above concept through simplified examples, and attempting to engage in a meaningful discussion where (hopefully) you walk away knowing something new.

I never set out to lay out the grand design of a perfectly impregnable digital fortress, nor by contrast explain the nuances of every single technique in the hacker's arsonal. I never suggested you were wrong that websites can securely tell you your password's expired. I was explaining the idea behind notabot's comments which you clearly didn't understand.

That's not to say I agree fully with notabot, but they came here, and they tried to tell you about a concept they knew a bit about. That's kind. Correct or not, they tried doing something nice for you.

You mischaracterized what they were trying to say, so I tried to step in and fill in a few conceptual blanks for you. Next time I'll just keep my mouth shut. I'm sorry I intruded into your safe space where you just wanted to feel vindicated in how you felt due to a bad user experience.

Have a nice life.

P.S. DDOS doesn't mean what you think it does. Its broader than that. DOS = Denial of service. That can take many forms. One form would be overwhelming the infrastructure and causing the service to stop responding. That's what you're thinking of. Another form would be making it where all the users can't log in. Same effect, the service isn't being provided anymore. Nobody can log in. D = distributed, meaning you can't just IP block the jerk who's keeping your users locked out. And locked out doesn't necessarily mean what you seem to think it does either. One form of lockout means "contact the admin so they can unlock your user", another means I just keep failing to sign in as you, hundereds of times, and the service never lets the real you in, correct password or not. I hope you at least learned a few new words today.