You really need an income considerably above average to be able to think about FIRE in Poland (whereas in US you could probably retire early on an average salary). In that regard, it's less applicable.
I think this really gets to the crux of my original point: What is "average" (average for our industry, average for the country as a whole?) and retire "where" (I assure you, if you make an average US salary and want to retire early in the US, you have to have front-loaded a lot of financial sacrifices and been extremely lucky)