It is a lot easier, yes.
The NLW is something that has been debated and defined in law. "Frontline staff" is not and has not. It's incredibly open to interpretation and disagreement.
The Queen's Speech needs to be simpler than that - especially when running a tiny majority. You can't afford for items or language that are open to interpretation or discussion because you have to guarantee it passes.
Are you joking? Read the Queen's Speech, there is loads that is open to interpretation! It passes because you have the numbers, which is where Tory politicians who pretend to care could actually influence things if they weren't just pretending, because they only just have the numbers.
https://www.gov.uk/government/speeches/queens-speech-2017?_sm_au_=iVVjkZbkvQt5ns6R
Almost all of it is open to interpretation, e.g.: My government’s priority is to secure the best possible deal as the country leaves the European Union.
Best deal according to who? I'm not sure you can find anybody that can agree on that. And that's just the second line of the speech.