I believe that the point of the Czechia situation was that it was a modification to the constitution; this will have a higher bar to change than would be the case for simply enacting an ordinary law. The idea was to entrench the status quo behind the bar for constitutional modification.

kagis

Looks like it's a 60% supermajority in each legislative house:

https://en.wikipedia.org/wiki/Constitution_of_the_Czech_Republic#Amending_the_Constitution

With reference to the provision of the article 39, paragraph 4 of the Constitution, which states that "for the enactment of a constitutional act, 3/5 of all deputies must agree, and 3/5 of senators present", changing the constitution is a more difficult procedure than changing an ordinary statute, making it an entrenched constitution in the typology of constitutions. Despite the tradition of entrenched constitutions throughout Czech history, some voiced the opinion, during the preparation of the Constitution of the Czech Republic, that this one should be flexible.

So to produce such an effect, if there are laws that would prohibit bans on end-to-end encryption, say, those laws would need to be constitutional law or similar in an EU member state where such a law has a higher-than-ordinary bar to change.

Forget other EU countries and laws, the German constitution guarantees private postal and remote communications for every citizen. It's also why Germany has historically never (that I know of) voted in favor of this bullshit: it violates the Briefgeheimnis (article 10 of the German constitution)

If they hadn't rejected it the federal constitutional court in Karlsruhe would have sacked every single proposal on how to implement it, a process our current coalition is very familiar with from multiple attempts at trying to push preemptive collection of unencrypted data. They knew it wouldn't pass here anyway and likely just waited on an opportune time to profit off the inevitable denial. Although I'll give them that: some parts of the coalition were rather eager to meet the judges in Karlsruhe again anyway so it wasn't a 100% guaranteed rejection either.