Nations goes through peaks and slumps in terms of prospect development. It's still too early to say what Germany's future will be. I'm sure Stützle and Seider will be impact players, and Draisaitl still has many good years in front of him, but to reach the Czech's level they need ten years of consistant quantity in the drafts.
Draisaitl was drafted in 2014. Since then, Germany has had a total of ten players drafted (five in the 1st round, one in the 2nd round. In the same time span, the Czech's have had a total of 59 players drafted (eight in the 1st round, seven in the 2nd round). Sure, on average, Germany has produced more quality prospects lately, but if the Czech's continue to have 6x higher quantity, they are also gonna hit more home runs over time.
I hope Germany continue's to do well. The market potential there is huge, and would increase the interest for hockey all over Europe. But they still have long ways to go before joining the "big 6".
The Czech's looked like they were in deep trouble until Pastrnak emerged, and now Necas has had a breakout season and Vrana and Hronek are looking good in Detroit. They have several other depth players in the NHL who are still young, such as Chytil and Zacha, and they can most likely look forward to two defensemen being drafted in the 1st round in both 2021 (Svozil) and 2022 (Jiricik). Also, while drafted late in the third round, Lukas Dostal is currently one of the world's most intriguing young goaltenders.
Slovakia on the other hand have miles to go. Cernak has solidify himself as a top 4 defenseman and Fehervary is on good track as well. Ruzicka and Pospisil are making nice progress in the minors and Studenic made his NHL debute this season. They have to players (Nemec and Slafkovsky) projected to be drafted in the 1st round next year (possibly in the top 10 even), and then another one or two first round picks in 2023 (Dvorsky and Ciernik). But it's still too early to tell if this is a result of their improved program, or if it's just a coincidence.