Sure, but the explanation is still Poland’s potential and its capacity to fulfil it. You could be free all you want and still plateau on some immediate post-war rebound gains.
Then it seems our politicians stopped being pragmatic and started bringing up ideological issues more often, which divided the population, while IMO not doing nearly enough to promote further development of the economy.
So now we have a population split on ideological issues, while Poland and Croatia are overtaking us economy-wise. We have had every advantage (geographically at the crossroads of multiple trade routes, sea access, EU funds, hard-working population, didn't turn into a Russia-style oligarchy...) but mostly slept on it.