All the voters should concentrate on one thing mainly - economy
Nah, should focus on the state organization and its workings. It should be a framework that would allow the economy to blossom due to the creativity and industry of its citizens. A state should protect from outside and inside interference in that process and ensure a level playing field for all involved.
All the parties in Poland are great at promoting secondary issues and avoiding the real problems.
That is true to some extent.
On the other hand, parties outside Poland do that too.
As to LGBT and other issues, it is a cultural wave of liberal democracy and after that comes to those nations and countries that are not powerful enough just before or after economical subjugation known as a new form of colonialism.