They are low compared to the world. However moving is NOT easy for personal reason. If you are going to move from the countries you listed Germany is going to be easier just because it isn't as hard to get back to visit family.

Is that true even if sum up higher taxes and cost of living in Germany? At least in Eastern Europe(specifically Russia, Belarus and Ukraine), average salary for mediocre software engineer is about 3k$ per month after taxes which is already comparable with German average SE salary. But cost of living in EE is a lot cheaper, apartments in Moscow are 3 times cheaper than in major German cities. Food, on average 2 times cheaper and transportation(taxes, public transport and fuel) sometimes up to 10 times cheaper than in Germany.

This. Quality and extended costs of life are definitely vague but important aspects when considering a move to Germany. There is no perfect lunch let alone free lunch.

Cost of living in Germany isn’t significantly higher than other western European countries. And for engineers, after-tax income is easily 50% higher in Germany compared to the countries I mentioned.