it's not simply a question of blaming PIS
It is more of a question of blaming PSL.
It says something about the Polish parliament and the Polish political scene
You perhaps don't know it, but about 65% of the European population is against the present winter/summer time arrangement. They would prefer the unchanged time throughout the year.
I'm in favor as I hate those dark mornings taking the kids to school.
And you will precisely have them once the winter/summer time arrangment is abolished in Poland. Either your Polish is not good enough to pick up this important difference or you have automatically assumed a return to the normal (winter) Polish time throughout the year in the proposal. In reality, the proposal is to fix the summer
time and not the winter one, so it is effectively going to be a change of the time zone
for Poland. Thus you should either opt for the present arrangment or for the fixation of the winter time if you don't like dark mornings in winter.