This is fascinating to me, do you have any examples of jurisdictions where this is the case?
Here in Germany the “taxes” (they’re technically mandatory insurances) than an employer will have to pay on top of the gross salary all have a salary cap, the largest one being around €85k. After that any increase in gross pay has no additional cost. Of course my personal tax rate might take a hike but that’s not the concern of my employer.
A lot of the conversation is about the value of the developers work being high enough to warrant higher salaries. With that argument we should look at gross salaries + taxes/fees paid by the employer on top of the gross salary.
Your personal tax rate is between you and the state.
This could mean hiring 1 really amazing engineer instead of 2 or even 3 average ones depending on the realities of your local market, and pay them based on what it would have cost you to pay the 2 or 3 engineers combined.
This is always a choice you have available, unless you're bootstrapping and can't even afford to make the first hire at those rates, at which point you're probably not looking to compete on the global stage to begin with, so this suggestion doesn't really apply.
Of course, the employee then has to pay VAT (19%) on everything they spend those 55% on.
Getting to that point is a bit of a chicken-and-egg problem, though. And firing policies is a political barrier that's hard to avoid. I suppose you could keep everyone on as contractors, paying them standard rates but going to them directly, not through an agency. That would land the salaries in the region suggested, and you'd still have the ability to fire without cause.
Nowhere in the world outside SF/NYC is there so much VC money that can support paying developers those salaries.
I would say over 90% of tech companies make their money from local markets. You can pay your developers as much as you make from your local market.
As for hiring. You have no idea how well someone is going to work out. Some people are really good at interviews but turn out to be terrible employees and vice versa. This is why the hiring process in tech tends to be pretty convoluted and broken in general. No one can figure this out. The laws regarding hiring are also much less liberal outside of CA. Hiring and firing is severely restricted in many places.
Very few companies are in the position of being "unwilling" to pay developers more. Some with plenty of cash are even simply limited by the tax laws how much they can pay. The cost of paying someone too much over local market rate incurs obscene tax costs.