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A bit over $50/hour

To be fair this is not new, they just raised the limit that keeps you in the simplified regime and the gap of negative marginal increase of income went from being around 5k to being over 50k wide.

Not quite. You can't have any deduction or detraction in t, e so-called-flat-tax regime, so your expenses are computed as a forfait depending on your profession. For us tech workers the magic number is 67%, so the effective tax rate is 10%.

Also I think that my calculations make the break-even point between the two different regimes a little over 100k.

This year I was forced to change to a 3 day work schedule (4 day weekend), by some recent boneheaded changes in Italian tax law for self-employed workers: if I were to make more before tax, I would make less after tax. That means that the average tax rate has a discontinuity and the marginal tax rate diverges at one point.

Even if this change was to be reversed by the new government I don't think I would go back to working full time: not only I'm less stressed and more productive (per hour worked), but a more interesting change is that you stop defining yourself by your profession. You are not a programmer, you code to pay the rent and are all the other things you do in the four days you have left.

(I'm using a throwaway, because it doesn't take long to figure out what the limit income is and derive roughly how much I make per hour)