In recent years due to the somewhat mixed economy, "competitive salary" in the Netherlands is typically in the 50-70k/year range in my experience (for mid/senior engineers). Salaries and freelance rates have been quite depressed in the last year or two.

Kinda depressing if that is commonly accepted as competitive.

Well it is competitive with other salaries in the Netherlands. If you don't have a family or want to buy a house then you can live reasonably well here on such a salary. If you have a family or are trying to buy a house though, it can be quite challenging. Median salary for everyone is lower still of course...

indeed, why anyone would want to be able to buy a house when getting paid a median salary of a professional full-time employee.

Anecdotally when I moved to the Netherlands I was making 50k and over two years later 70k at that same company with about 4 years of experience. If you look at talent.io tech report and other resources the median tech salary seems to be closer to 60k (70k Amsterdam) for all experience levels, all categories, so with some looking around you can find much better than that.

Damn, I don't think this is considered competitive in Poland, and that's even before taking taxes and CoL under account