Most employers will happily tell you that this is the case. That does not mean that it is so. If you rate it, those doors will, at many companies, open. But you have to rate doing something that is Not Normal, and you have to be able to communicate why you rate having the people dealing with your hiring stick their neck out and do something that is Not Normal. This is hard. Few people (not just engineers) can do that. But it can be done.
When you're hiring a "Programmer II" in a company like that, the salary is not going to change. You might be able to negotiate work-from-home a day or two a week, or an extra week of vacation or something, but you're simply not going to make more than the upper bound of that schedule, and being at the upper bound of that schedule will negatively impact raises until you get promoted.
The CEO or COO or CIO is not going to approve a $100k salary for a Programmer II when the band is $60-75k. It just won't happen.
On an extremely related note, there is zero ambition and very little technical skill at that company. The vast majority of folks with skill and ambition leave after 2-3 years.
I would also suggest your understanding of how often exceptions are made is very unlikely to be based on good data. Employers have ways of hiding that they are paying somebody more than their traditional salary structure when they need to make an exception. And a very strong incentive to do that hiding.
No, it wouldn't, because employers have a strong incentive to hide salary band violations, while employees have a strong incentive to discover when negotiations are possible.
> it strikes me as an extraordinary to claim successfully negotiating higher-than-average wages is typical.
Then you should probably go talk to somebody who made that claim. But it's a nonsensical claim, so my guess is not many would be making it.
I've never been a typical employee in my life. I have, however, been the highest-paid non-manager (or so I was told; this might have been an attempt to shame me into working more for free) in a hundred-person development group, well out of band, because I brought capabilities and skills to the table that they needed more than they needed to Maintain The Integrity Of The Salary Band.
And calling me "anonymous" is kind of funny.