Guba is miles away from being in medal contention at the olympics, unlike Schwanitz, so nothing to worry from a german perspective. In addition to that Germany has the 2015 U18 world champion (Julia Ritter), the 2017 U18 world champion (Selina Dantzler) and the 2016 U20 world champion (Alina Kenzel) in this event, so absolutely nothing to worry. At the last 2 youth world championships and the 2018 U20 world championships as well as the 2017 U20 european championships, the 2017 U23 european championships and the 2018 U18 european championships Germany was ahead of Poland in the medal table, so if anything Poland has to worry. At the moment Poland it looks as if Poland might win medals at the olympics in both hammer throws and maybe mens shot put, but once Wlodarczyk retires, it looks pretty dark. Kszczot is old as well and not a medal contender, the same is true for Malachowski. Lisek might surprise, but currently Lavillenie, Duplantis and Kendricks are clearly ahead of him. I think 4 medals are realistic for Poland at the next olympics. Germany on the other hand has 3 javelin throwers, C. Harting, mens decathlon, womens heptathlon, 20 km race walking, womens 4 x 100 m relay, Schwanitz, Dutkiewicz/Roleder and "sidekicks" like Gierisch, Mihambo, womens javelin throw or Storl and talents like Heinle, Lückenkemper, Klosterhalfen and so on.
If you are really convinced that polish athletics is in a better state, i would like to offer you a bet: I say that Germany will win at least 2 more medals in athletics than Poland at the next olympics, are you in?